180138987 has 24 divisors (see below), whose sum is σ = 314866656. Its totient is φ = 96880896.

The previous prime is 180138883. The next prime is 180139027. The reversal of 180138987 is 789831081.

It is not a de Polignac number, because 180138987 - 2¹⁵ = 180106219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (180138187) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83028 + ... + 85169.

It is an arithmetic number, because the mean of its divisors is an integer number (13119444).

Almost surely, 2^180138987 is an apocalyptic number.

180138987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

180138987 is a deficient number, since it is larger than the sum of its proper divisors (134727669).

180138987 is a wasteful number, since it uses less digits than its factorization.

180138987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168227 (or 168224 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The square root of 180138987 is about 13421.5866051671. The cubic root of 180138987 is about 564.7669041346.

It can be divided in two parts, 18013 and 8987, that added together give a cube (27000 = 30³).

The spelling of 180138987 in words is "one hundred eighty million, one hundred thirty-eight thousand, nine hundred eighty-seven".