40829781 has 4 divisors (see below), whose sum is σ = 54439712. Its totient is φ = 27219852.

The previous prime is 40829779. The next prime is 40829783. The reversal of 40829781 is 18792804.

40829781 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 an interprime number because it is at equal distance from previous prime (40829779) and next prime (40829783).

It is not a de Polignac number, because 40829781 - 2¹ = 40829779 is a prime.

It is a super-2 number, since 2×40829781² = 3334142033015922, 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 (40829783) 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, 6804961 + ... + 6804966.

It is an arithmetic number, because the mean of its divisors is an integer number (13609928).

Almost surely, 2^40829781 is an apocalyptic number.

It is an amenable number.

40829781 is a deficient number, since it is larger than the sum of its proper divisors (13609931).

40829781 is a wasteful number, since it uses less digits than its factorization.

40829781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13609930.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 40829781 is about 6389.8185420245. The cubic root of 40829781 is about 344.3438652994.

The spelling of 40829781 in words is "forty million, eight hundred twenty-nine thousand, seven hundred eighty-one".