187128140 has 24 divisors (see below), whose sum is σ = 393882720. Its totient is φ = 74677248.

The previous prime is 187128101. The next prime is 187128173. The reversal of 187128140 is 41821781.

187128140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 187128097 and 187128106.

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, 1877 + ... + 19436.

It is an arithmetic number, because the mean of its divisors is an integer number (16411780).

Almost surely, 2^187128140 is an apocalyptic number.

187128140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

187128140 is an abundant number, since it is smaller than the sum of its proper divisors (206754580).

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

187128140 is a wasteful number, since it uses less digits than its factorization.

187128140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21761 (or 21759 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 32.

The square root of 187128140 is about 13679.4787912405. The cubic root of 187128140 is about 571.9784944724.

The spelling of 187128140 in words is "one hundred eighty-seven million, one hundred twenty-eight thousand, one hundred forty".