638675403 has 8 divisors (see below), whose sum is σ = 859526208. Its totient is φ = 421804104.

The previous prime is 638675357. The next prime is 638675447. The reversal of 638675403 is 304576836.

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

It is not a de Polignac number, because 638675403 - 2¹² = 638671307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638675483) 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, 994501 + ... + 995142.

It is an arithmetic number, because the mean of its divisors is an integer number (107440776).

Almost surely, 2^638675403 is an apocalyptic number.

638675403 is a deficient number, since it is larger than the sum of its proper divisors (220850805).

638675403 is a wasteful number, since it uses less digits than its factorization.

638675403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1989753.

The product of its (nonzero) digits is 362880, while the sum is 42.

The square root of 638675403 is about 25272.0280745333. The cubic root of 638675403 is about 861.1789325159.

The spelling of 638675403 in words is "six hundred thirty-eight million, six hundred seventy-five thousand, four hundred three".