42808657 has 2 divisors, whose sum is σ = 42808658. Its totient is φ = 42808656.

The previous prime is 42808643. The next prime is 42808673. The reversal of 42808657 is 75680824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25160256 + 17648401 = 5016^2 + 4201^2 .

It is a cyclic number.

It is not a de Polignac number, because 42808657 - 2⁷ = 42808529 is a prime.

It is a super-2 number, since 2×42808657² = 3665162228287298, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42808627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21404328 + 21404329.

It is an arithmetic number, because the mean of its divisors is an integer number (21404329).

Almost surely, 2^42808657 is an apocalyptic number.

It is an amenable number.

42808657 is a deficient number, since it is larger than the sum of its proper divisors (1).

42808657 is an equidigital number, since it uses as much as digits as its factorization.

42808657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 42808657 is about 6542.8324905961. The cubic root of 42808657 is about 349.8193816374.

The spelling of 42808657 in words is "forty-two million, eight hundred eight thousand, six hundred fifty-seven".