40438931 has 8 divisors (see below), whose sum is σ = 43649424. Its totient is φ = 37242720.

The previous prime is 40438927. The next prime is 40438939. The reversal of 40438931 is 13983404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40438931 - 2² = 40438927 is a prime.

It is a super-2 number, since 2×40438931² = 3270614280845522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40438939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2741 + ... + 9401.

It is an arithmetic number, because the mean of its divisors is an integer number (5456178).

Almost surely, 2^40438931 is an apocalyptic number.

40438931 is a deficient number, since it is larger than the sum of its proper divisors (3210493).

40438931 is a wasteful number, since it uses less digits than its factorization.

40438931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7141.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 40438931 is about 6359.1611868233. The cubic root of 40438931 is about 343.2415771602.

The spelling of 40438931 in words is "forty million, four hundred thirty-eight thousand, nine hundred thirty-one".