638117293 has 8 divisors (see below), whose sum is σ = 703021536. Its totient is φ = 574362000.

The previous prime is 638117243. The next prime is 638117327. The reversal of 638117293 is 392711836.

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

It is a cyclic number.

It is not a de Polignac number, because 638117293 - 2¹⁷ = 637986221 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 (638117243) 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, 286071 + ... + 288292.

It is an arithmetic number, because the mean of its divisors is an integer number (87877692).

Almost surely, 2^638117293 is an apocalyptic number.

It is an amenable number.

638117293 is a deficient number, since it is larger than the sum of its proper divisors (64904243).

638117293 is a wasteful number, since it uses less digits than its factorization.

638117293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574475.

The product of its digits is 54432, while the sum is 40.

The square root of 638117293 is about 25260.9836110948. The cubic root of 638117293 is about 860.9280107691.

The spelling of 638117293 in words is "six hundred thirty-eight million, one hundred seventeen thousand, two hundred ninety-three".