639174 has 16 divisors (see below), whose sum is σ = 1286208. Its totient is φ = 211752.

The previous prime is 639169. The next prime is 639181. The reversal of 639174 is 471936.

It is a happy number.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

639174 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1669 + ... + 2015.

It is an arithmetic number, because the mean of its divisors is an integer number (80388).

2⁶³⁹¹⁷⁴ is an apocalyptic number.

639174 is an abundant number, since it is smaller than the sum of its proper divisors (647034).

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

639174 is a wasteful number, since it uses less digits than its factorization.

639174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659.

The product of its digits is 4536, while the sum is 30.

The square root of 639174 is about 799.4835833211. The cubic root of 639174 is about 86.1402974099.

The spelling of 639174 in words is "six hundred thirty-nine thousand, one hundred seventy-four".