260406857 has 2 divisors, whose sum is σ = 260406858. Its totient is φ = 260406856.

The previous prime is 260406829. The next prime is 260406871. The reversal of 260406857 is 758604062.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254593936 + 5812921 = 15956^2 + 2411^2 .

It is a cyclic number.

It is not a de Polignac number, because 260406857 - 2⁶ = 260406793 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 260406857.

It is not a weakly prime, because it can be changed into another prime (260406827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130203428 + 130203429.

It is an arithmetic number, because the mean of its divisors is an integer number (130203429).

Almost surely, 2^260406857 is an apocalyptic number.

It is an amenable number.

260406857 is a deficient number, since it is larger than the sum of its proper divisors (1).

260406857 is an equidigital number, since it uses as much as digits as its factorization.

260406857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 260406857 is about 16137.1266649302. The cubic root of 260406857 is about 638.5831751712.

The spelling of 260406857 in words is "two hundred sixty million, four hundred six thousand, eight hundred fifty-seven".