40328631 has 64 divisors (see below), whose sum is σ = 71987200. Its totient is φ = 21835008.

The previous prime is 40328609. The next prime is 40328633. The reversal of 40328631 is 13682304.

It is a happy number.

40328631 is a `hidden beast` number, since 4 + 0 + 3 + 28 + 631 = 666.

It is not a de Polignac number, because 40328631 - 2⁵ = 40328599 is a prime.

It is a super-2 number, since 2×40328631² = 3252796956668322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 40328595 and 40328604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40328633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 510450 + ... + 510528.

It is an arithmetic number, because the mean of its divisors is an integer number (1124800).

Almost surely, 2^40328631 is an apocalyptic number.

40328631 is a deficient number, since it is larger than the sum of its proper divisors (31658569).

40328631 is a wasteful number, since it uses less digits than its factorization.

40328631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 40328631 is about 6350.4827375563. The cubic root of 40328631 is about 342.9292212299.

The spelling of 40328631 in words is "forty million, three hundred twenty-eight thousand, six hundred thirty-one".