638492 has 6 divisors (see below), whose sum is σ = 1117368. Its totient is φ = 319244.

The previous prime is 638489. The next prime is 638501. The reversal of 638492 is 294836.

638492 = 279² + 280² + ... + 286².

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79808 + ... + 79815.

It is an arithmetic number, because the mean of its divisors is an integer number (186228).

2⁶³⁸⁴⁹² is an apocalyptic number.

It is an amenable number.

638492 is a deficient number, since it is larger than the sum of its proper divisors (478876).

638492 is a wasteful number, since it uses less digits than its factorization.

638492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159627 (or 159625 counting only the distinct ones).

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

The square root of 638492 is about 799.0569441535. The cubic root of 638492 is about 86.1096492140.

The spelling of 638492 in words is "six hundred thirty-eight thousand, four hundred ninety-two".