188138748 has 24 divisors (see below), whose sum is σ = 501703552. Its totient is φ = 53753904.

The previous prime is 188138723. The next prime is 188138749. The reversal of 188138748 is 847831881.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 188138697 and 188138706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188138749) 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, 1119790 + ... + 1119957.

Almost surely, 2^188138748 is an apocalyptic number.

It is an amenable number.

188138748 is an abundant number, since it is smaller than the sum of its proper divisors (313564804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

188138748 is a wasteful number, since it uses less digits than its factorization.

188138748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2239761 (or 2239759 counting only the distinct ones).

The product of its digits is 344064, while the sum is 48.

The square root of 188138748 is about 13716.3678865799. The cubic root of 188138748 is about 573.0063259020.

The spelling of 188138748 in words is "one hundred eighty-eight million, one hundred thirty-eight thousand, seven hundred forty-eight".