187385820 has 48 divisors (see below), whose sum is σ = 542777760. Its totient is φ = 48246016.

The previous prime is 187385819. The next prime is 187385879. The reversal of 187385820 is 28583781.

It is a happy number.

It is a super-2 number, since 2×187385820² = 70226891074144800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52107 + ... + 55586.

It is an arithmetic number, because the mean of its divisors is an integer number (11307870).

Almost surely, 2^187385820 is an apocalyptic number.

187385820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

187385820 is an abundant number, since it is smaller than the sum of its proper divisors (355391940).

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

187385820 is a wasteful number, since it uses less digits than its factorization.

187385820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107734 (or 107732 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 187385820 is about 13688.8940385993. The cubic root of 187385820 is about 572.2409168213.

The spelling of 187385820 in words is "one hundred eighty-seven million, three hundred eighty-five thousand, eight hundred twenty".