18481887 has 12 divisors (see below), whose sum is σ = 26749840. Its totient is φ = 12296448.

The previous prime is 18481871. The next prime is 18481891. The reversal of 18481887 is 78818481.

It is not a de Polignac number, because 18481887 - 2⁴ = 18481871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18481807) 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, 3414 + ... + 6972.

Almost surely, 2^18481887 is an apocalyptic number.

18481887 is a deficient number, since it is larger than the sum of its proper divisors (8267953).

18481887 is a wasteful number, since it uses less digits than its factorization.

18481887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4142 (or 4139 counting only the distinct ones).

The product of its digits is 114688, while the sum is 45.

The square root of 18481887 is about 4299.0565244016. The cubic root of 18481887 is about 264.3922801106.

The spelling of 18481887 in words is "eighteen million, four hundred eighty-one thousand, eight hundred eighty-seven".