638395330 has 16 divisors (see below), whose sum is σ = 1162957824. Its totient is φ = 252281200.

The previous prime is 638395327. The next prime is 638395333. The reversal of 638395330 is 33593836.

It is an interprime number because it is at equal distance from previous prime (638395327) and next prime (638395333).

It is not an unprimeable number, because it can be changed into a prime (638395333) 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, 383746 + ... + 385405.

It is an arithmetic number, because the mean of its divisors is an integer number (72684864).

Almost surely, 2^638395330 is an apocalyptic number.

638395330 is a deficient number, since it is larger than the sum of its proper divisors (524562494).

638395330 is a wasteful number, since it uses less digits than its factorization.

638395330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769241.

The product of its (nonzero) digits is 174960, while the sum is 40.

The square root of 638395330 is about 25266.4863010273. The cubic root of 638395330 is about 861.0530322381.

It can be divided in two parts, 63839 and 5330, that added together give a square (69169 = 263²).

The spelling of 638395330 in words is "six hundred thirty-eight million, three hundred ninety-five thousand, three hundred thirty".