257463394 has 4 divisors (see below), whose sum is σ = 386195094. Its totient is φ = 128731696.

The previous prime is 257463391. The next prime is 257463407. The reversal of 257463394 is 493364752.

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

It can be written as a sum of positive squares in only one way, i.e., 224550225 + 32913169 = 14985^2 + 5737^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 257463394.

It is not an unprimeable number, because it can be changed into a prime (257463391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64365847 + ... + 64365850.

Almost surely, 2^257463394 is an apocalyptic number.

257463394 is a deficient number, since it is larger than the sum of its proper divisors (128731700).

257463394 is a wasteful number, since it uses less digits than its factorization.

257463394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128731699.

The product of its digits is 544320, while the sum is 43.

The square root of 257463394 is about 16045.6658945648. The cubic root of 257463394 is about 636.1680149571.

The spelling of 257463394 in words is "two hundred fifty-seven million, four hundred sixty-three thousand, three hundred ninety-four".