40004431 has 4 divisors (see below), whose sum is σ = 40118112. Its totient is φ = 39890752.

The previous prime is 40004413. The next prime is 40004467. The reversal of 40004431 is 13440004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40004431 - 2⁵ = 40004399 is a prime.

It is a super-2 number, since 2×40004431² = 3200708999267522, 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 (40004131) 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, 56311 + ... + 57016.

It is an arithmetic number, because the mean of its divisors is an integer number (10029528).

Almost surely, 2^40004431 is an apocalyptic number.

40004431 is a deficient number, since it is larger than the sum of its proper divisors (113681).

40004431 is a wasteful number, since it uses less digits than its factorization.

40004431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113680.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 40004431 is about 6324.9056119439. The cubic root of 40004431 is about 342.0078170414.

Adding to 40004431 its reverse (13440004), we get a palindrome (53444435).

The spelling of 40004431 in words is "forty million, four thousand, four hundred thirty-one".