180993987 has 16 divisors (see below), whose sum is σ = 268692480. Its totient is φ = 120413736.

The previous prime is 180993979. The next prime is 180993991. The reversal of 180993987 is 789399081.

It is not a de Polignac number, because 180993987 - 2³ = 180993979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (180993907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6918 + ... + 20244.

It is an arithmetic number, because the mean of its divisors is an integer number (16793280).

Almost surely, 2^180993987 is an apocalyptic number.

180993987 is a deficient number, since it is larger than the sum of its proper divisors (87698493).

180993987 is a wasteful number, since it uses less digits than its factorization.

180993987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13839 (or 13833 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The square root of 180993987 is about 13453.4005738326. The cubic root of 180993987 is about 565.6590185252.

The spelling of 180993987 in words is "one hundred eighty million, nine hundred ninety-three thousand, nine hundred eighty-seven".