638073994 has 8 divisors (see below), whose sum is σ = 969226560. Its totient is φ = 314998476.

The previous prime is 638073973. The next prime is 638074009. The reversal of 638073994 is 499370836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×638073994² = 814276843638224072, which contains 22 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 2019064 + ... + 2019379.

It is an arithmetic number, because the mean of its divisors is an integer number (121153320).

Almost surely, 2^638073994 is an apocalyptic number.

638073994 is a deficient number, since it is larger than the sum of its proper divisors (331152566).

638073994 is a wasteful number, since it uses less digits than its factorization.

638073994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4038524.

The product of its (nonzero) digits is 979776, while the sum is 49.

The square root of 638073994 is about 25260.1265634201. The cubic root of 638073994 is about 860.9085377738.

The spelling of 638073994 in words is "six hundred thirty-eight million, seventy-three thousand, nine hundred ninety-four".