187938690 has 32 divisors (see below), whose sum is σ = 474793920. Its totient is φ = 47479104.

The previous prime is 187938637. The next prime is 187938713. The reversal of 187938690 is 96839781.

187938690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×187938690² = 70641902397832200, which contains 22 as substring.

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, 164289 + ... + 165428.

It is an arithmetic number, because the mean of its divisors is an integer number (14837310).

Almost surely, 2^187938690 is an apocalyptic number.

187938690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

187938690 is an abundant number, since it is smaller than the sum of its proper divisors (286855230).

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

187938690 is a wasteful number, since it uses less digits than its factorization.

187938690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329746.

The product of its (nonzero) digits is 653184, while the sum is 51.

The square root of 187938690 is about 13709.0732728365. The cubic root of 187938690 is about 572.8031511048.

The spelling of 187938690 in words is "one hundred eighty-seven million, nine hundred thirty-eight thousand, six hundred ninety".