638924 has 24 divisors (see below), whose sum is σ = 1314768. Its totient is φ = 267840.

The previous prime is 638923. The next prime is 638933. The reversal of 638924 is 429836.

638924 = T₈₇ + T₈₈ + ... + T₁₆₄.

It is not an unprimeable number, because it can be changed into a prime (638923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14 + ... + 1130.

It is an arithmetic number, because the mean of its divisors is an integer number (54782).

2⁶³⁸⁹²⁴ is an apocalyptic number.

It is an amenable number.

638924 is an abundant number, since it is smaller than the sum of its proper divisors (675844).

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

638924 is a wasteful number, since it uses less digits than its factorization.

638924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145 (or 1143 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 638924 is about 799.3272171020. The cubic root of 638924 is about 86.1290652662.

The spelling of 638924 in words is "six hundred thirty-eight thousand, nine hundred twenty-four".