42390657 has 12 divisors (see below), whose sum is σ = 61544340. Its totient is φ = 28115808.

The previous prime is 42390629. The next prime is 42390659. The reversal of 42390657 is 75609324.

It can be written as a sum of positive squares in 2 ways, for example, as 23415921 + 18974736 = 4839^2 + 4356^2 .

It is not a de Polignac number, because 42390657 - 2²³ = 34002049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42390659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10182 + ... + 13727.

It is an arithmetic number, because the mean of its divisors is an integer number (5128695).

Almost surely, 2^42390657 is an apocalyptic number.

It is an amenable number.

42390657 is a deficient number, since it is larger than the sum of its proper divisors (19153683).

42390657 is a wasteful number, since it uses less digits than its factorization.

42390657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24112 (or 24109 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 42390657 is about 6510.8107790044. The cubic root of 42390657 is about 348.6770657210.

The spelling of 42390657 in words is "forty-two million, three hundred ninety thousand, six hundred fifty-seven".