257821234 has 24 divisors (see below), whose sum is σ = 438810624. Its totient is φ = 113407800.

The previous prime is 257821211. The next prime is 257821261. The reversal of 257821234 is 432128752.

257821234 = 1380² + 1381² + ... + 1503².

It is a happy number.

257821234 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 257821234.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9682 + ... + 24685.

It is an arithmetic number, because the mean of its divisors is an integer number (18283776).

Almost surely, 2^257821234 is an apocalyptic number.

257821234 is a deficient number, since it is larger than the sum of its proper divisors (180989390).

257821234 is a wasteful number, since it uses less digits than its factorization.

257821234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34422 (or 34411 counting only the distinct ones).

The product of its digits is 26880, while the sum is 34.

The square root of 257821234 is about 16056.8126974191. The cubic root of 257821234 is about 636.4626082638.

Adding to 257821234 its reverse (432128752), we get a palindrome (689949986).

The spelling of 257821234 in words is "two hundred fifty-seven million, eight hundred twenty-one thousand, two hundred thirty-four".