42845657 has 2 divisors, whose sum is σ = 42845658. Its totient is φ = 42845656.

The previous prime is 42845653. The next prime is 42845669. The reversal of 42845657 is 75654824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40208281 + 2637376 = 6341^2 + 1624^2 .

It is a cyclic number.

It is not a de Polignac number, because 42845657 - 2² = 42845653 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42845651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21422828 + 21422829.

It is an arithmetic number, because the mean of its divisors is an integer number (21422829).

Almost surely, 2^42845657 is an apocalyptic number.

It is an amenable number.

42845657 is a deficient number, since it is larger than the sum of its proper divisors (1).

42845657 is an equidigital number, since it uses as much as digits as its factorization.

42845657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 268800, while the sum is 41.

The square root of 42845657 is about 6545.6594014660. The cubic root of 42845657 is about 349.9201368802.

The spelling of 42845657 in words is "forty-two million, eight hundred forty-five thousand, six hundred fifty-seven".