42407257 has 2 divisors, whose sum is σ = 42407258. Its totient is φ = 42407256.

The previous prime is 42407249. The next prime is 42407303. The reversal of 42407257 is 75270424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37650496 + 4756761 = 6136^2 + 2181^2 .

It is a cyclic number.

It is not a de Polignac number, because 42407257 - 2³ = 42407249 is a prime.

It is not a weakly prime, because it can be changed into another prime (42407227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21203628 + 21203629.

It is an arithmetic number, because the mean of its divisors is an integer number (21203629).

Almost surely, 2^42407257 is an apocalyptic number.

It is an amenable number.

42407257 is a deficient number, since it is larger than the sum of its proper divisors (1).

42407257 is an equidigital number, since it uses as much as digits as its factorization.

42407257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15680, while the sum is 31.

The square root of 42407257 is about 6512.0854570560. The cubic root of 42407257 is about 348.7225732640.

The spelling of 42407257 in words is "forty-two million, four hundred seven thousand, two hundred fifty-seven".