257981397 has 8 divisors (see below), whose sum is σ = 344129760. Its totient is φ = 171910320.

The previous prime is 257981377. The next prime is 257981407. The reversal of 257981397 is 793189752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 257981397 - 2¹¹ = 257979349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257981327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11022 + ... + 25247.

It is an arithmetic number, because the mean of its divisors is an integer number (43016220).

Almost surely, 2^257981397 is an apocalyptic number.

It is an amenable number.

257981397 is a deficient number, since it is larger than the sum of its proper divisors (86148363).

257981397 is a wasteful number, since it uses less digits than its factorization.

257981397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38643.

The product of its digits is 952560, while the sum is 51.

The square root of 257981397 is about 16061.7993076741. The cubic root of 257981397 is about 636.5943748344.

The spelling of 257981397 in words is "two hundred fifty-seven million, nine hundred eighty-one thousand, three hundred ninety-seven".