257423347 has 2 divisors, whose sum is σ = 257423348. Its totient is φ = 257423346.

The previous prime is 257423329. The next prime is 257423363. The reversal of 257423347 is 743324752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257423347 - 2⁷ = 257423219 is a prime.

It is not a weakly prime, because it can be changed into another prime (257423377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128711673 + 128711674.

It is an arithmetic number, because the mean of its divisors is an integer number (128711674).

Almost surely, 2^257423347 is an apocalyptic number.

257423347 is a deficient number, since it is larger than the sum of its proper divisors (1).

257423347 is an equidigital number, since it uses as much as digits as its factorization.

257423347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 37.

The square root of 257423347 is about 16044.4179389593. The cubic root of 257423347 is about 636.1350291138.

It can be divided in two parts, 2574 and 23347, that added together give a square (25921 = 161²).

The spelling of 257423347 in words is "two hundred fifty-seven million, four hundred twenty-three thousand, three hundred forty-seven".