18969885 has 48 divisors (see below), whose sum is σ = 37776960. Its totient is φ = 8709120.

The previous prime is 18969877. The next prime is 18969901. The reversal of 18969885 is 58896981.

It is not a de Polignac number, because 18969885 - 2³ = 18969877 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8397 + ... + 10413.

It is an arithmetic number, because the mean of its divisors is an integer number (787020).

Almost surely, 2^18969885 is an apocalyptic number.

18969885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18969885 is a deficient number, since it is larger than the sum of its proper divisors (18807075).

18969885 is a wasteful number, since it uses less digits than its factorization.

18969885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2058 (or 2055 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 54.

The square root of 18969885 is about 4355.4431462252. The cubic root of 18969885 is about 266.6991097680.

It can be divided in two parts, 1896 and 9885, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 18969885 in words is "eighteen million, nine hundred sixty-nine thousand, eight hundred eighty-five".