18999995 has 12 divisors (see below), whose sum is σ = 26522784. Its totient is φ = 13028400.

The previous prime is 18999991. The next prime is 18999997. The reversal of 18999995 is 59999981.

It is not a de Polignac number, because 18999995 - 2² = 18999991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18999991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38531 + ... + 39020.

It is an arithmetic number, because the mean of its divisors is an integer number (2210232).

Almost surely, 2^18999995 is an apocalyptic number.

18999995 is a deficient number, since it is larger than the sum of its proper divisors (7522789).

18999995 is an equidigital number, since it uses as much as digits as its factorization.

18999995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77570 (or 77563 counting only the distinct ones).

The product of its digits is 2361960, while the sum is 59.

The square root of 18999995 is about 4358.8983700013. The cubic root of 18999995 is about 266.8401414652.

The spelling of 18999995 in words is "eighteen million, nine hundred ninety-nine thousand, nine hundred ninety-five".