638874233 has 4 divisors (see below), whose sum is σ = 639906960. Its totient is φ = 637841508.

The previous prime is 638874217. The next prime is 638874287. The reversal of 638874233 is 332478836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 638874233 - 2⁴ = 638874217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638870233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515435 + ... + 516672.

It is an arithmetic number, because the mean of its divisors is an integer number (159976740).

Almost surely, 2^638874233 is an apocalyptic number.

It is an amenable number.

638874233 is a deficient number, since it is larger than the sum of its proper divisors (1032727).

638874233 is a wasteful number, since it uses less digits than its factorization.

638874233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032726.

The product of its digits is 580608, while the sum is 44.

The square root of 638874233 is about 25275.9615643006. The cubic root of 638874233 is about 861.2682895616.

The spelling of 638874233 in words is "six hundred thirty-eight million, eight hundred seventy-four thousand, two hundred thirty-three".