187139890 has 32 divisors (see below), whose sum is σ = 387016704. Its totient is φ = 63821760.

The previous prime is 187139857. The next prime is 187139899. The reversal of 187139890 is 98931781.

187139890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 187139890.

It is not an unprimeable number, because it can be changed into a prime (187139899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6372 + ... + 20368.

It is an arithmetic number, because the mean of its divisors is an integer number (12094272).

Almost surely, 2^187139890 is an apocalyptic number.

187139890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

187139890 is an abundant number, since it is smaller than the sum of its proper divisors (199876814).

187139890 is a wasteful number, since it uses less digits than its factorization.

187139890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14202.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 187139890 is about 13679.9082599263. The cubic root of 187139890 is about 571.9904659601.

The spelling of 187139890 in words is "one hundred eighty-seven million, one hundred thirty-nine thousand, eight hundred ninety".