638809093 has 8 divisors (see below), whose sum is σ = 688197888. Its totient is φ = 589455984.

The previous prime is 638809063. The next prime is 638809103. The reversal of 638809093 is 390908836.

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

It is not a de Polignac number, because 638809093 - 2⁹ = 638808581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638809043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37080 + ... + 51502.

It is an arithmetic number, because the mean of its divisors is an integer number (86024736).

Almost surely, 2^638809093 is an apocalyptic number.

It is an amenable number.

638809093 is a deficient number, since it is larger than the sum of its proper divisors (49388795).

638809093 is a wasteful number, since it uses less digits than its factorization.

638809093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17843.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 638809093 is about 25274.6729553520. The cubic root of 638809093 is about 861.2390167562.

The spelling of 638809093 in words is "six hundred thirty-eight million, eight hundred nine thousand, ninety-three".