638291092 has 12 divisors (see below), whose sum is σ = 1175799520. Its totient is φ = 302348376.

The previous prime is 638291089. The next prime is 638291099. The reversal of 638291092 is 290192836.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638291099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4199208 + ... + 4199359.

Almost surely, 2^638291092 is an apocalyptic number.

It is an amenable number.

638291092 is a deficient number, since it is larger than the sum of its proper divisors (537508428).

638291092 is a wasteful number, since it uses less digits than its factorization.

638291092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8398590 (or 8398588 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 638291092 is about 25264.4234448364. The cubic root of 638291092 is about 861.0061650764.

The spelling of 638291092 in words is "six hundred thirty-eight million, two hundred ninety-one thousand, ninety-two".