638692 has 6 divisors (see below), whose sum is σ = 1117718. Its totient is φ = 319344.

The previous prime is 638689. The next prime is 638699. The reversal of 638692 is 296836.

It is a happy number.

638692 is nontrivially palindromic in base 7.

It can be written as a sum of positive squares in only one way, i.e., 331776 + 306916 = 576^2 + 554^2 .

It is not an unprimeable number, because it can be changed into a prime (638699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79833 + ... + 79840.

2⁶³⁸⁶⁹² is an apocalyptic number.

It is an amenable number.

638692 is a deficient number, since it is larger than the sum of its proper divisors (479026).

638692 is a wasteful number, since it uses less digits than its factorization.

638692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159677 (or 159675 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 638692 is about 799.1820818812. The cubic root of 638692 is about 86.1186392154.

The spelling of 638692 in words is "six hundred thirty-eight thousand, six hundred ninety-two".