40656631 has 4 divisors (see below), whose sum is σ = 40671072. Its totient is φ = 40642192.

The previous prime is 40656619. The next prime is 40656643. The reversal of 40656631 is 13665604.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (40656619) and next prime (40656643).

It is a cyclic number.

It is not a de Polignac number, because 40656631 - 2¹⁹ = 40132343 is a prime.

It is a super-2 number, since 2×40656631² = 3305923288540322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40656593 and 40656602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40656611) 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 3 ways as a sum of consecutive naturals, for example, 1471 + ... + 9136.

It is an arithmetic number, because the mean of its divisors is an integer number (10167768).

Almost surely, 2^40656631 is an apocalyptic number.

40656631 is a deficient number, since it is larger than the sum of its proper divisors (14441).

40656631 is a wasteful number, since it uses less digits than its factorization.

40656631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14440.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 40656631 is about 6376.2552489686. The cubic root of 40656631 is about 343.8564137321.

The spelling of 40656631 in words is "forty million, six hundred fifty-six thousand, six hundred thirty-one".