120987 has 8 divisors (see below), whose sum is σ = 179280. Its totient is φ = 80640.

The previous prime is 120977. The next prime is 120997. The reversal of 120987 is 789021.

It is an interprime number because it is at equal distance from previous prime (120977) and next prime (120997).

It is not a de Polignac number, because 120987 - 2¹⁰ = 119963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4481 = 120987 / (1 + 2 + 0 + 9 + 8 + 7).

It is a self number, because there is not a number n which added to its sum of digits gives 120987.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 120987.

It is not an unprimeable number, because it can be changed into a prime (120907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2214 + ... + 2267.

It is an arithmetic number, because the mean of its divisors is an integer number (22410).

2¹²⁰⁹⁸⁷ is an apocalyptic number.

120987 is a deficient number, since it is larger than the sum of its proper divisors (58293).

120987 is an equidigital number, since it uses as much as digits as its factorization.

120987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4490 (or 4484 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 120987 is about 347.8318559304. The cubic root of 120987 is about 49.4591030430.

It can be divided in two parts, 1209 and 87, that added together give a 4-th power (1296 = 6⁴).

The spelling of 120987 in words is "one hundred twenty thousand, nine hundred eighty-seven".