18914987 has 24 divisors (see below), whose sum is σ = 23892480. Its totient is φ = 14657760.

The previous prime is 18914963. The next prime is 18915007. The reversal of 18914987 is 78941981.

It is not a de Polignac number, because 18914987 - 2⁶ = 18914923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18914927) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69662 + ... + 69932.

It is an arithmetic number, because the mean of its divisors is an integer number (995520).

Almost surely, 2^18914987 is an apocalyptic number.

18914987 is a deficient number, since it is larger than the sum of its proper divisors (4977493).

18914987 is a wasteful number, since it uses less digits than its factorization.

18914987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 350 counting only the distinct ones).

The product of its digits is 145152, while the sum is 47.

The square root of 18914987 is about 4349.1363510472. The cubic root of 18914987 is about 266.4415894196.

The spelling of 18914987 in words is "eighteen million, nine hundred fourteen thousand, nine hundred eighty-seven".