257700397 has 2 divisors, whose sum is σ = 257700398. Its totient is φ = 257700396.

The previous prime is 257700371. The next prime is 257700413. The reversal of 257700397 is 793007752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230857636 + 26842761 = 15194^2 + 5181^2 .

It is a cyclic number.

It is not a de Polignac number, because 257700397 - 2⁷ = 257700269 is a prime.

It is a super-2 number, since 2×257700397² = 132818989227915218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257700347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128850198 + 128850199.

It is an arithmetic number, because the mean of its divisors is an integer number (128850199).

Almost surely, 2^257700397 is an apocalyptic number.

It is an amenable number.

257700397 is a deficient number, since it is larger than the sum of its proper divisors (1).

257700397 is an equidigital number, since it uses as much as digits as its factorization.

257700397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92610, while the sum is 40.

The square root of 257700397 is about 16053.0494610837. The cubic root of 257700397 is about 636.3631591876.

The spelling of 257700397 in words is "two hundred fifty-seven million, seven hundred thousand, three hundred ninety-seven".