638837343 has 6 divisors (see below), whose sum is σ = 922765064. Its totient is φ = 425891556.

The previous prime is 638837333. The next prime is 638837363. The reversal of 638837343 is 343738836.

638837343 is a `hidden beast` number, since 638 + 8 + 3 + 7 + 3 + 4 + 3 = 666.

It is not a de Polignac number, because 638837343 - 2⁴ = 638837327 is a prime.

It is a super-2 number, since 2×638837343² = 816226301622599298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638837333) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35490955 + ... + 35490972.

Almost surely, 2^638837343 is an apocalyptic number.

638837343 is a deficient number, since it is larger than the sum of its proper divisors (283927721).

638837343 is a wasteful number, since it uses less digits than its factorization.

638837343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70981933 (or 70981930 counting only the distinct ones).

The product of its digits is 870912, while the sum is 45.

The square root of 638837343 is about 25275.2318090260. The cubic root of 638837343 is about 861.2517120689.

The spelling of 638837343 in words is "six hundred thirty-eight million, eight hundred thirty-seven thousand, three hundred forty-three".