40431556 has 12 divisors (see below), whose sum is σ = 77187600. Its totient is φ = 18377960.

The previous prime is 40431529. The next prime is 40431557. The reversal of 40431556 is 65513404.

It is a super-2 number, since 2×40431556² = 3269421441162272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40431557) 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, 459406 + ... + 459493.

It is an arithmetic number, because the mean of its divisors is an integer number (6432300).

Almost surely, 2^40431556 is an apocalyptic number.

It is an amenable number.

40431556 is a deficient number, since it is larger than the sum of its proper divisors (36756044).

40431556 is a wasteful number, since it uses less digits than its factorization.

40431556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918914 (or 918912 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 40431556 is about 6358.5812883064. The cubic root of 40431556 is about 343.2207098056.

The spelling of 40431556 in words is "forty million, four hundred thirty-one thousand, five hundred fifty-six".