18442519 has 4 divisors (see below), whose sum is σ = 18491560. Its totient is φ = 18393480.

The previous prime is 18442511. The next prime is 18442531. The reversal of 18442519 is 91524481.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18442519 - 2³ = 18442511 is a prime.

It is a super-2 number, since 2×18442519² = 680253014130722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18442511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23952 + ... + 24709.

It is an arithmetic number, because the mean of its divisors is an integer number (4622890).

Almost surely, 2^18442519 is an apocalyptic number.

18442519 is a deficient number, since it is larger than the sum of its proper divisors (49041).

18442519 is an equidigital number, since it uses as much as digits as its factorization.

18442519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49040.

The product of its digits is 11520, while the sum is 34.

The square root of 18442519 is about 4294.4754045168. The cubic root of 18442519 is about 264.2044206054.

The spelling of 18442519 in words is "eighteen million, four hundred forty-two thousand, five hundred nineteen".