18850987 has 4 divisors (see below), whose sum is σ = 19206720. Its totient is φ = 18495256.

The previous prime is 18850973. The next prime is 18851017. The reversal of 18850987 is 78905881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18850987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18850927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177787 + ... + 177892.

It is an arithmetic number, because the mean of its divisors is an integer number (4801680).

Almost surely, 2^18850987 is an apocalyptic number.

18850987 is a deficient number, since it is larger than the sum of its proper divisors (355733).

18850987 is an equidigital number, since it uses as much as digits as its factorization.

18850987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355732.

The product of its (nonzero) digits is 161280, while the sum is 46.

The square root of 18850987 is about 4341.7723339669. The cubic root of 18850987 is about 266.1407427874.

The spelling of 18850987 in words is "eighteen million, eight hundred fifty thousand, nine hundred eighty-seven".