857425739 has 2 divisors, whose sum is σ = 857425740. Its totient is φ = 857425738.

The previous prime is 857425729. The next prime is 857425757. The reversal of 857425739 is 937524758.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857425739 is a prime.

It is a super-2 number, since 2×857425739² = 1470357795799392242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (857425729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428712869 + 428712870.

It is an arithmetic number, because the mean of its divisors is an integer number (428712870).

Almost surely, 2^857425739 is an apocalyptic number.

857425739 is a deficient number, since it is larger than the sum of its proper divisors (1).

857425739 is an equidigital number, since it uses as much as digits as its factorization.

857425739 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 857425739 is about 29281.8329173568. The cubic root of 857425739 is about 950.0187397965.

The spelling of 857425739 in words is "eight hundred fifty-seven million, four hundred twenty-five thousand, seven hundred thirty-nine".