18985995 has 80 divisors (see below), whose sum is σ = 40168128. Its totient is φ = 8398080.

The previous prime is 18985987. The next prime is 18985999. The reversal of 18985995 is 59958981.

It is not a de Polignac number, because 18985995 - 2³ = 18985987 is a prime.

It is a super-2 number, since 2×18985995² = 720936012280050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18985999) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 104805 + ... + 104985.

Almost surely, 2^18985995 is an apocalyptic number.

18985995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18985995 is an abundant number, since it is smaller than the sum of its proper divisors (21182133).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18985995 is a wasteful number, since it uses less digits than its factorization.

18985995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 233 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 54.

The square root of 18985995 is about 4357.2921637182. The cubic root of 18985995 is about 266.7745856600.

The spelling of 18985995 in words is "eighteen million, nine hundred eighty-five thousand, nine hundred ninety-five".