639120 has 40 divisors (see below), whose sum is σ = 1982016. Its totient is φ = 170368.

The previous prime is 639091. The next prime is 639137. The reversal of 639120 is 21936.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

639120 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1092 + ... + 1571.

2⁶³⁹¹²⁰ is an apocalyptic number.

639120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

639120 is an abundant number, since it is smaller than the sum of its proper divisors (1342896).

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

639120 is a wasteful number, since it uses less digits than its factorization.

639120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679 (or 2673 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 639120 is about 799.4498108074. The cubic root of 639120 is about 86.1378715149.

The spelling of 639120 in words is "six hundred thirty-nine thousand, one hundred twenty".