40663857 has 16 divisors (see below), whose sum is σ = 61463360. Its totient is φ = 23706432.

The previous prime is 40663849. The next prime is 40663871. The reversal of 40663857 is 75836604.

It is not a de Polignac number, because 40663857 - 2³ = 40663849 is a prime.

It is a super-2 number, since 2×40663857² = 3307098532232898, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40663807) 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, 26698 + ... + 28179.

It is an arithmetic number, because the mean of its divisors is an integer number (3841460).

Almost surely, 2^40663857 is an apocalyptic number.

It is an amenable number.

40663857 is a deficient number, since it is larger than the sum of its proper divisors (20799503).

40663857 is a wasteful number, since it uses less digits than its factorization.

40663857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54912.

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 40663857 is about 6376.8218573205. The cubic root of 40663857 is about 343.8767839988.

The spelling of 40663857 in words is "forty million, six hundred sixty-three thousand, eight hundred fifty-seven".