257194639 has 8 divisors (see below), whose sum is σ = 277624592. Its totient is φ = 236856960.

The previous prime is 257194607. The next prime is 257194661. The reversal of 257194639 is 936491752.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 257194639 - 2⁵ = 257194607 is a prime.

It is a super-2 number, since 2×257194639² = 132298164660680642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257194699) 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, 17217 + ... + 28474.

It is an arithmetic number, because the mean of its divisors is an integer number (34703074).

Almost surely, 2^257194639 is an apocalyptic number.

257194639 is a deficient number, since it is larger than the sum of its proper divisors (20429953).

257194639 is a wasteful number, since it uses less digits than its factorization.

257194639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46137.

The product of its digits is 408240, while the sum is 46.

The square root of 257194639 is about 16037.2890165389. The cubic root of 257194639 is about 635.9465817179.

The spelling of 257194639 in words is "two hundred fifty-seven million, one hundred ninety-four thousand, six hundred thirty-nine".