18904995 has 20 divisors (see below), whose sum is σ = 33889680. Its totient is φ = 10082448.

The previous prime is 18904987. The next prime is 18904997. The reversal of 18904995 is 59940981.

It is not a de Polignac number, because 18904995 - 2³ = 18904987 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18904995.

It is not an unprimeable number, because it can be changed into a prime (18904997) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22935 + ... + 23744.

It is an arithmetic number, because the mean of its divisors is an integer number (1694484).

Almost surely, 2^18904995 is an apocalyptic number.

18904995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18904995 is a deficient number, since it is larger than the sum of its proper divisors (14984685).

18904995 is an equidigital number, since it uses as much as digits as its factorization.

18904995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46696 (or 46687 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 18904995 is about 4347.9874654833. The cubic root of 18904995 is about 266.3946644902.

The spelling of 18904995 in words is "eighteen million, nine hundred four thousand, nine hundred ninety-five".