30987 has 12 divisors (see below), whose sum is σ = 48984. Its totient is φ = 18720.

The previous prime is 30983. The next prime is 31013. The reversal of 30987 is 78903.

It is a happy number.

30987 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 30987 - 2² = 30983 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 30987.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 30987.

It is not an unprimeable number, because it can be changed into a prime (30983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58 + ... + 255.

It is an arithmetic number, because the mean of its divisors is an integer number (4082).

2³⁰⁹⁸⁷ is an apocalyptic number.

30987 is a deficient number, since it is larger than the sum of its proper divisors (17997).

30987 is a wasteful number, since it uses less digits than its factorization.

30987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 30987 is about 176.0312472262. The cubic root of 30987 is about 31.4094147327.

The spelling of 30987 in words is "thirty thousand, nine hundred eighty-seven".