40864657 has 4 divisors (see below), whose sum is σ = 40949056. Its totient is φ = 40780260.

The previous prime is 40864627. The next prime is 40864661. The reversal of 40864657 is 75646804.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40864657 - 2¹⁹ = 40340369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40864627) 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, 41469 + ... + 42442.

It is an arithmetic number, because the mean of its divisors is an integer number (10237264).

Almost surely, 2^40864657 is an apocalyptic number.

It is an amenable number.

40864657 is a deficient number, since it is larger than the sum of its proper divisors (84399).

40864657 is an equidigital number, since it uses as much as digits as its factorization.

40864657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84398.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 40864657 is about 6392.5469884859. The cubic root of 40864657 is about 344.4418813275.

The spelling of 40864657 in words is "forty million, eight hundred sixty-four thousand, six hundred fifty-seven".