40642057 has 4 divisors (see below), whose sum is σ = 40668160. Its totient is φ = 40615956.

The previous prime is 40642051. The next prime is 40642061. The reversal of 40642057 is 75024604.

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 40642057 - 2⁷ = 40641929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40642051) 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, 10557 + ... + 13882.

It is an arithmetic number, because the mean of its divisors is an integer number (10167040).

Almost surely, 2^40642057 is an apocalyptic number.

It is an amenable number.

40642057 is a deficient number, since it is larger than the sum of its proper divisors (26103).

40642057 is a wasteful number, since it uses less digits than its factorization.

40642057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26102.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 40642057 is about 6375.1123127361. The cubic root of 40642057 is about 343.8153219334.

The spelling of 40642057 in words is "forty million, six hundred forty-two thousand, fifty-seven".