638054434 has 8 divisors (see below), whose sum is σ = 957234348. Its totient is φ = 318976320.

The previous prime is 638054429. The next prime is 638054441. The reversal of 638054434 is 434450836.

It can be written as a sum of positive squares in 2 ways, for example, as 484220025 + 153834409 = 22005^2 + 12403^2 .

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

It is a super-2 number, since 2×638054434² = 814226921494120712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638054393 and 638054402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7147 + ... + 36430.

Almost surely, 2^638054434 is an apocalyptic number.

638054434 is a deficient number, since it is larger than the sum of its proper divisors (319179914).

638054434 is a wasteful number, since it uses less digits than its factorization.

638054434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50900.

The product of its (nonzero) digits is 138240, while the sum is 37.

The square root of 638054434 is about 25259.7393889961. The cubic root of 638054434 is about 860.8997407047.

The spelling of 638054434 in words is "six hundred thirty-eight million, fifty-four thousand, four hundred thirty-four".