18087419 has 8 divisors (see below), whose sum is σ = 21093600. Its totient is φ = 15503208.

The previous prime is 18087401. The next prime is 18087457. The reversal of 18087419 is 91478081.

It is a de Polignac number, because none of the positive numbers 2^k-18087419 is a prime.

It is a super-2 number, since 2×18087419² = 654309452163122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18087479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26024 + ... + 26709.

It is an arithmetic number, because the mean of its divisors is an integer number (2636700).

Almost surely, 2^18087419 is an apocalyptic number.

18087419 is a deficient number, since it is larger than the sum of its proper divisors (3006181).

18087419 is an frugal number, since it uses more digits than its factorization.

18087419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52754 (or 52740 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 18087419 is about 4252.9306366316. The cubic root of 18087419 is about 262.4977184987.

The spelling of 18087419 in words is "eighteen million, eighty-seven thousand, four hundred nineteen".