40656681 has 16 divisors (see below), whose sum is σ = 64865920. Its totient is φ = 25019280.

The previous prime is 40656667. The next prime is 40656689. The reversal of 40656681 is 18665604.

It is not a de Polignac number, because 40656681 - 2⁹ = 40656169 is a prime.

It is a super-2 number, since 2×40656681² = 3305931419871522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40656689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57565 + ... + 58266.

It is an arithmetic number, because the mean of its divisors is an integer number (4054120).

Almost surely, 2^40656681 is an apocalyptic number.

It is an amenable number.

40656681 is a deficient number, since it is larger than the sum of its proper divisors (24209239).

40656681 is a wasteful number, since it uses less digits than its factorization.

40656681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115853 (or 115847 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 40656681 is about 6376.2591697640. The cubic root of 40656681 is about 343.8565546916.

The spelling of 40656681 in words is "forty million, six hundred fifty-six thousand, six hundred eighty-one".