40051657 has 4 divisors (see below), whose sum is σ = 40558720. Its totient is φ = 39544596.

The previous prime is 40051637. The next prime is 40051663. The reversal of 40051657 is 75615004.

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 a de Polignac number, because none of the positive numbers 2^k-40051657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40051637) 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, 253413 + ... + 253570.

It is an arithmetic number, because the mean of its divisors is an integer number (10139680).

Almost surely, 2^40051657 is an apocalyptic number.

It is an amenable number.

40051657 is a deficient number, since it is larger than the sum of its proper divisors (507063).

40051657 is an equidigital number, since it uses as much as digits as its factorization.

40051657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507062.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 40051657 is about 6328.6378471200. The cubic root of 40051657 is about 342.1423463852.

The spelling of 40051657 in words is "forty million, fifty-one thousand, six hundred fifty-seven".