427505657 has 2 divisors, whose sum is σ = 427505658. Its totient is φ = 427505656.

The previous prime is 427505641. The next prime is 427505707. The reversal of 427505657 is 756505724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 405780736 + 21724921 = 20144^2 + 4661^2 .

It is a cyclic number.

It is not a de Polignac number, because 427505657 - 2⁴ = 427505641 is a prime.

It is a super-2 number, since 2×427505657² = 365522173534003298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (427505357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213752828 + 213752829.

It is an arithmetic number, because the mean of its divisors is an integer number (213752829).

Almost surely, 2^427505657 is an apocalyptic number.

It is an amenable number.

427505657 is a deficient number, since it is larger than the sum of its proper divisors (1).

427505657 is an equidigital number, since it uses as much as digits as its factorization.

427505657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 294000, while the sum is 41.

The square root of 427505657 is about 20676.2099283210. The cubic root of 427505657 is about 753.3219501025.

The spelling of 427505657 in words is "four hundred twenty-seven million, five hundred five thousand, six hundred fifty-seven".