639476 has 6 divisors (see below), whose sum is σ = 1119090. Its totient is φ = 319736.

The previous prime is 639451. The next prime is 639487. The reversal of 639476 is 674936.

639476 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 624100 + 15376 = 790^2 + 124^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 639476.

It is an unprimeable number.

639476 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 as a sum of consecutive naturals, namely, 79931 + ... + 79938.

It is an arithmetic number, because the mean of its divisors is an integer number (186515).

2⁶³⁹⁴⁷⁶ is an apocalyptic number.

It is an amenable number.

639476 is a deficient number, since it is larger than the sum of its proper divisors (479614).

639476 is a wasteful number, since it uses less digits than its factorization.

639476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159873 (or 159871 counting only the distinct ones).

The product of its digits is 27216, while the sum is 35.

The square root of 639476 is about 799.6724329374. The cubic root of 639476 is about 86.1538619342.

The spelling of 639476 in words is "six hundred thirty-nine thousand, four hundred seventy-six".