857392457 has 2 divisors, whose sum is σ = 857392458. Its totient is φ = 857392456.

The previous prime is 857392441. The next prime is 857392463. The reversal of 857392457 is 754293758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 592484281 + 264908176 = 24341^2 + 16276^2 .

It is a cyclic number.

It is not a de Polignac number, because 857392457 - 2⁴ = 857392441 is a prime.

It is not a weakly prime, because it can be changed into another prime (857394457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428696228 + 428696229.

It is an arithmetic number, because the mean of its divisors is an integer number (428696229).

Almost surely, 2^857392457 is an apocalyptic number.

It is an amenable number.

857392457 is a deficient number, since it is larger than the sum of its proper divisors (1).

857392457 is an equidigital number, since it uses as much as digits as its factorization.

857392457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 50.

The square root of 857392457 is about 29281.2646072536. The cubic root of 857392457 is about 950.0064476017.

The spelling of 857392457 in words is "eight hundred fifty-seven million, three hundred ninety-two thousand, four hundred fifty-seven".