257434 has 4 divisors (see below), whose sum is σ = 386154. Its totient is φ = 128716.

The previous prime is 257407. The next prime is 257437. The reversal of 257434 is 434752.

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., 216225 + 41209 = 465^2 + 203^2 .

It is a nialpdrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 257399 and 257408.

It is not an unprimeable number, because it can be changed into a prime (257437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64357 + ... + 64360.

2²⁵⁷⁴³⁴ is an apocalyptic number.

257434 is a deficient number, since it is larger than the sum of its proper divisors (128720).

257434 is a wasteful number, since it uses less digits than its factorization.

257434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128719.

The product of its digits is 3360, while the sum is 25.

The square root of 257434 is about 507.3795423546. The cubic root of 257434 is about 63.6143804092.

The spelling of 257434 in words is "two hundred fifty-seven thousand, four hundred thirty-four".