18996405 has 16 divisors (see below), whose sum is σ = 30824064. Its totient is φ = 9988160.

The previous prime is 18996403. The next prime is 18996451. The reversal of 18996405 is 50469981.

It is not a de Polignac number, because 18996405 - 2¹ = 18996403 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18996401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7854 + ... + 9983.

It is an arithmetic number, because the mean of its divisors is an integer number (1926504).

Almost surely, 2^18996405 is an apocalyptic number.

18996405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18996405 is a deficient number, since it is larger than the sum of its proper divisors (11827659).

18996405 is a wasteful number, since it uses less digits than its factorization.

18996405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17916.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 18996405 is about 4358.4865492508. The cubic root of 18996405 is about 266.8233341546.

The spelling of 18996405 in words is "eighteen million, nine hundred ninety-six thousand, four hundred five".