18519995 has 16 divisors (see below), whose sum is σ = 24276672. Its totient is φ = 13480320.

The previous prime is 18519979. The next prime is 18519997. The reversal of 18519995 is 59991581.

It is not a de Polignac number, because 18519995 - 2⁴ = 18519979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18519997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2609 + ... + 6621.

It is an arithmetic number, because the mean of its divisors is an integer number (1517292).

Almost surely, 2^18519995 is an apocalyptic number.

18519995 is a deficient number, since it is larger than the sum of its proper divisors (5756677).

18519995 is a wasteful number, since it uses less digits than its factorization.

18519995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4102.

The product of its digits is 145800, while the sum is 47.

The square root of 18519995 is about 4303.4863773457. The cubic root of 18519995 is about 264.5738731126.

The spelling of 18519995 in words is "eighteen million, five hundred nineteen thousand, nine hundred ninety-five".