638043253 has 8 divisors (see below), whose sum is σ = 667332288. Its totient is φ = 608883264.

The previous prime is 638043251. The next prime is 638043293. The reversal of 638043253 is 352340836.

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 638043253 - 2¹ = 638043251 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 (638043251) 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, 22075 + ... + 41992.

It is an arithmetic number, because the mean of its divisors is an integer number (83416536).

Almost surely, 2^638043253 is an apocalyptic number.

It is an amenable number.

638043253 is a deficient number, since it is larger than the sum of its proper divisors (29289035).

638043253 is a wasteful number, since it uses less digits than its factorization.

638043253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64523.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 638043253 is about 25259.5180674533. The cubic root of 638043253 is about 860.8947119926.

The spelling of 638043253 in words is "six hundred thirty-eight million, forty-three thousand, two hundred fifty-three".