40438431 has 12 divisors (see below), whose sum is σ = 63721320. Its totient is φ = 24508080.

The previous prime is 40438367. The next prime is 40438469. The reversal of 40438431 is 13483404.

40438431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40438431 - 2⁶ = 40438367 is a prime.

It is a super-2 number, since 2×40438431² = 3270533403483522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40438395 and 40438404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40438031) 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 11 ways as a sum of consecutive naturals, for example, 204136 + ... + 204333.

It is an arithmetic number, because the mean of its divisors is an integer number (5310110).

Almost surely, 2^40438431 is an apocalyptic number.

40438431 is a deficient number, since it is larger than the sum of its proper divisors (23282889).

40438431 is a wasteful number, since it uses less digits than its factorization.

40438431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408486 (or 408483 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 40438431 is about 6359.1218733407. The cubic root of 40438431 is about 343.2401625044.

The spelling of 40438431 in words is "forty million, four hundred thirty-eight thousand, four hundred thirty-one".