40395631 has 4 divisors (see below), whose sum is σ = 40426264. Its totient is φ = 40365000.

The previous prime is 40395599. The next prime is 40395643. The reversal of 40395631 is 13659304.

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 40395631 - 2⁵ = 40395599 is a prime.

It is a super-2 number, since 2×40395631² = 3263614007776322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40395593 and 40395602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40395661) 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, 13245 + ... + 16006.

It is an arithmetic number, because the mean of its divisors is an integer number (10106566).

Almost surely, 2^40395631 is an apocalyptic number.

40395631 is a deficient number, since it is larger than the sum of its proper divisors (30633).

40395631 is a wasteful number, since it uses less digits than its factorization.

40395631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30632.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 40395631 is about 6355.7557379119. The cubic root of 40395631 is about 343.1190247278.

The spelling of 40395631 in words is "forty million, three hundred ninety-five thousand, six hundred thirty-one".