639274 has 8 divisors (see below), whose sum is σ = 1009440. Its totient is φ = 302796.

The previous prime is 639269. The next prime is 639299. The reversal of 639274 is 472936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8374 + ... + 8449.

It is an arithmetic number, because the mean of its divisors is an integer number (126180).

2⁶³⁹²⁷⁴ is an apocalyptic number.

639274 is a deficient number, since it is larger than the sum of its proper divisors (370166).

639274 is a wasteful number, since it uses less digits than its factorization.

639274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16844.

The product of its digits is 9072, while the sum is 31.

The square root of 639274 is about 799.5461212463. The cubic root of 639274 is about 86.1447894473.

The spelling of 639274 in words is "six hundred thirty-nine thousand, two hundred seventy-four".