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40678381 = 57797039
BaseRepresentation
bin1001101100101…
…1001111101101
32211112200020201
42123023033231
540403202011
64011513501
71002521602
oct233131755
984480221
1040678381
1120a642a7
1211758891
138573563
14558c6a9
153887cc1
hex26cb3ed

40678381 has 4 divisors (see below), whose sum is σ = 40691200. Its totient is φ = 40665564.

The previous prime is 40678369. The next prime is 40678397. The reversal of 40678381 is 18387604.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40678381 - 25 = 40678349 is a prime.

It is a super-2 number, since 2×406783812 = 3309461361562322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40678381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40678321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2260 + ... + 9298.

It is an arithmetic number, because the mean of its divisors is an integer number (10172800).

Almost surely, 240678381 is an apocalyptic number.

It is an amenable number.

40678381 is a deficient number, since it is larger than the sum of its proper divisors (12819).

40678381 is an equidigital number, since it uses as much as digits as its factorization.

40678381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12818.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 40678381 is about 6377.9605674541. The cubic root of 40678381 is about 343.9177202034.

It can be divided in two parts, 406 and 78381, that added together give a palindrome (78787).

The spelling of 40678381 in words is "forty million, six hundred seventy-eight thousand, three hundred eighty-one".

Divisors: 1 5779 7039 40678381