42397657 has 2 divisors, whose sum is σ = 42397658. Its totient is φ = 42397656.

The previous prime is 42397651. The next prime is 42397669. The reversal of 42397657 is 75679324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41718681 + 678976 = 6459^2 + 824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42397657 is a prime.

It is a super-2 number, since 2×42397657² = 3595122638179298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42397651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21198828 + 21198829.

It is an arithmetic number, because the mean of its divisors is an integer number (21198829).

Almost surely, 2^42397657 is an apocalyptic number.

It is an amenable number.

42397657 is a deficient number, since it is larger than the sum of its proper divisors (1).

42397657 is an equidigital number, since it uses as much as digits as its factorization.

42397657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 43.

The square root of 42397657 is about 6511.3483242720. The cubic root of 42397657 is about 348.6962570971.

The spelling of 42397657 in words is "forty-two million, three hundred ninety-seven thousand, six hundred fifty-seven".