18900987 has 16 divisors (see below), whose sum is σ = 29168640. Its totient is φ = 10662912.

The previous prime is 18900983. The next prime is 18900997. The reversal of 18900987 is 78900981.

It is not a de Polignac number, because 18900987 - 2² = 18900983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18900983) 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, 4038 + ... + 7355.

It is an arithmetic number, because the mean of its divisors is an integer number (1823040).

Almost surely, 2^18900987 is an apocalyptic number.

18900987 is a deficient number, since it is larger than the sum of its proper divisors (10267653).

18900987 is a wasteful number, since it uses less digits than its factorization.

18900987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11482.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 18900987 is about 4347.5265381594. The cubic root of 18900987 is about 266.3758372741.

The spelling of 18900987 in words is "eighteen million, nine hundred thousand, nine hundred eighty-seven".