18964890 has 48 divisors (see below), whose sum is σ = 56354688. Its totient is φ = 4334688.

The previous prime is 18964879. The next prime is 18964931. The reversal of 18964890 is 9846981.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14422 + ... + 15681.

It is an arithmetic number, because the mean of its divisors is an integer number (1174056).

Almost surely, 2^18964890 is an apocalyptic number.

18964890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18964890 is an abundant number, since it is smaller than the sum of its proper divisors (37389798).

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

18964890 is a wasteful number, since it uses less digits than its factorization.

18964890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30123 (or 30120 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 18964890 is about 4354.8696880619. The cubic root of 18964890 is about 266.6756993468.

It can be divided in two parts, 1896 and 4890, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 18964890 in words is "eighteen million, nine hundred sixty-four thousand, eight hundred ninety".