257993467 has 4 divisors (see below), whose sum is σ = 260892360. Its totient is φ = 255094576.

The previous prime is 257993423. The next prime is 257993509. The reversal of 257993467 is 764399752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257993467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257993167) 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 3 ways as a sum of consecutive naturals, for example, 1449313 + ... + 1449490.

It is an arithmetic number, because the mean of its divisors is an integer number (65223090).

Almost surely, 2^257993467 is an apocalyptic number.

257993467 is a deficient number, since it is larger than the sum of its proper divisors (2898893).

257993467 is an equidigital number, since it uses as much as digits as its factorization.

257993467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2898892.

The product of its digits is 2857680, while the sum is 52.

The square root of 257993467 is about 16062.1750395144. The cubic root of 257993467 is about 636.6043026488.

The spelling of 257993467 in words is "two hundred fifty-seven million, nine hundred ninety-three thousand, four hundred sixty-seven".