257981399 has 8 divisors (see below), whose sum is σ = 278135760. Its totient is φ = 237871296.

The previous prime is 257981377. The next prime is 257981407. The reversal of 257981399 is 993189752.

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

It is not a de Polignac number, because 257981399 - 2¹² = 257977303 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 257981399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257981699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1592 + ... + 22770.

It is an arithmetic number, because the mean of its divisors is an integer number (34766970).

Almost surely, 2^257981399 is an apocalyptic number.

257981399 is a deficient number, since it is larger than the sum of its proper divisors (20154361).

257981399 is a wasteful number, since it uses less digits than its factorization.

257981399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22129.

The product of its digits is 1224720, while the sum is 53.

The square root of 257981399 is about 16061.7993699336. The cubic root of 257981399 is about 636.5943764794.

The spelling of 257981399 in words is "two hundred fifty-seven million, nine hundred eighty-one thousand, three hundred ninety-nine".