738921638 has 16 divisors (see below), whose sum is σ = 1364163360. Its totient is φ = 292320576.

The previous prime is 738921619. The next prime is 738921641. The reversal of 738921638 is 836129837.

It is a junction number, because it is equal to n+sod(n) for n = 738921592 and 738921601.

It is a congruent 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, 2029823 + ... + 2030186.

It is an arithmetic number, because the mean of its divisors is an integer number (85260210).

Almost surely, 2^738921638 is an apocalyptic number.

738921638 is a deficient number, since it is larger than the sum of its proper divisors (625241722).

738921638 is a wasteful number, since it uses less digits than its factorization.

738921638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060031.

The product of its digits is 435456, while the sum is 47.

The square root of 738921638 is about 27183.1131035428. The cubic root of 738921638 is about 904.0645943806.

The spelling of 738921638 in words is "seven hundred thirty-eight million, nine hundred twenty-one thousand, six hundred thirty-eight".