188993620 has 12 divisors (see below), whose sum is σ = 396886644. Its totient is φ = 75597440.

The previous prime is 188993611. The next prime is 188993633. The reversal of 188993620 is 26399881.

It can be written as a sum of positive squares in 2 ways, for example, as 52243984 + 136749636 = 7228^2 + 11694^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4724821 + ... + 4724860.

It is an arithmetic number, because the mean of its divisors is an integer number (33073887).

Almost surely, 2^188993620 is an apocalyptic number.

188993620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188993620 is an abundant number, since it is smaller than the sum of its proper divisors (207893024).

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

188993620 is a wasteful number, since it uses less digits than its factorization.

188993620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9449690 (or 9449688 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 188993620 is about 13747.4950445527. The cubic root of 188993620 is about 573.8728973511.

The spelling of 188993620 in words is "one hundred eighty-eight million, nine hundred ninety-three thousand, six hundred twenty".