239406857 has 2 divisors, whose sum is σ = 239406858. Its totient is φ = 239406856.

The previous prime is 239406809. The next prime is 239406863. The reversal of 239406857 is 758604932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128504896 + 110901961 = 11336^2 + 10531^2 .

It is a cyclic number.

It is not a de Polignac number, because 239406857 - 2¹⁸ = 239144713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (239406457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119703428 + 119703429.

It is an arithmetic number, because the mean of its divisors is an integer number (119703429).

Almost surely, 2^239406857 is an apocalyptic number.

It is an amenable number.

239406857 is a deficient number, since it is larger than the sum of its proper divisors (1).

239406857 is an equidigital number, since it uses as much as digits as its factorization.

239406857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 239406857 is about 15472.7779341655. Note that the first 3 decimals coincide. The cubic root of 239406857 is about 620.9341251888.

The spelling of 239406857 in words is "two hundred thirty-nine million, four hundred six thousand, eight hundred fifty-seven".