638038355 has 8 divisors (see below), whose sum is σ = 773539872. Its totient is φ = 505168128.

The previous prime is 638038337. The next prime is 638038361. The reversal of 638038355 is 553830836.

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 638038355 - 2¹⁰ = 638037331 is a prime.

It is a super-2 number, since 2×638038355² = 814185884902212050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 657287 + ... + 658256.

It is an arithmetic number, because the mean of its divisors is an integer number (96692484).

Almost surely, 2^638038355 is an apocalyptic number.

638038355 is a deficient number, since it is larger than the sum of its proper divisors (135501517).

638038355 is a wasteful number, since it uses less digits than its factorization.

638038355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315645.

The product of its (nonzero) digits is 259200, while the sum is 41.

The square root of 638038355 is about 25259.4211137152. The cubic root of 638038355 is about 860.8925090734.

The spelling of 638038355 in words is "six hundred thirty-eight million, thirty-eight thousand, three hundred fifty-five".