256172 has 18 divisors (see below), whose sum is σ = 521892. Its totient is φ = 109704.

The previous prime is 256169. The next prime is 256181. The reversal of 256172 is 271652.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256172.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 458 + ... + 849.

It is an arithmetic number, because the mean of its divisors is an integer number (28994).

2²⁵⁶¹⁷² is an apocalyptic number.

It is an amenable number.

256172 is an abundant number, since it is smaller than the sum of its proper divisors (265720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256172 is a wasteful number, since it uses less digits than its factorization.

256172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325 (or 1316 counting only the distinct ones).

The product of its digits is 840, while the sum is 23.

The square root of 256172 is about 506.1343695107. The cubic root of 256172 is about 63.5102593629.

The spelling of 256172 in words is "two hundred fifty-six thousand, one hundred seventy-two".