40306381 has 4 divisors (see below), whose sum is σ = 40989600. Its totient is φ = 39623164.

The previous prime is 40306379. The next prime is 40306423. The reversal of 40306381 is 18360304.

40306381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 40306381 - 2¹ = 40306379 is a prime.

It is a super-2 number, since 2×40306381² = 3249208698634322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40306361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341521 + ... + 341638.

It is an arithmetic number, because the mean of its divisors is an integer number (10247400).

Almost surely, 2^40306381 is an apocalyptic number.

It is an amenable number.

40306381 is a deficient number, since it is larger than the sum of its proper divisors (683219).

40306381 is an equidigital number, since it uses as much as digits as its factorization.

40306381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683218.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 40306381 is about 6348.7306605336. The cubic root of 40306381 is about 342.8661429764.

Adding to 40306381 its reverse (18360304), we get a palindrome (58666685).

The spelling of 40306381 in words is "forty million, three hundred six thousand, three hundred eighty-one".