638404214 has 16 divisors (see below), whose sum is σ = 1108262400. Its totient is φ = 270138024.

The previous prime is 638404201. The next prime is 638404219. The reversal of 638404214 is 412404836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638404219) 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, 287504 + ... + 289715.

It is an arithmetic number, because the mean of its divisors is an integer number (69266400).

Almost surely, 2^638404214 is an apocalyptic number.

638404214 is a deficient number, since it is larger than the sum of its proper divisors (469858186).

638404214 is a wasteful number, since it uses less digits than its factorization.

638404214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577307.

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 638404214 is about 25266.6621064200. The cubic root of 638404214 is about 861.0570263983.

The spelling of 638404214 in words is "six hundred thirty-eight million, four hundred four thousand, two hundred fourteen".