18423419 has 4 divisors (see below), whose sum is σ = 21055344. Its totient is φ = 15791496.

The previous prime is 18423341. The next prime is 18423421. The reversal of 18423419 is 91432481.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-18423419 is a prime.

It is a super-2 number, since 2×18423419² = 678844735299122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18423319) 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, 1315952 + ... + 1315965.

It is an arithmetic number, because the mean of its divisors is an integer number (5263836).

Almost surely, 2^18423419 is an apocalyptic number.

18423419 is a deficient number, since it is larger than the sum of its proper divisors (2631925).

18423419 is an equidigital number, since it uses as much as digits as its factorization.

18423419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631924.

The product of its digits is 6912, while the sum is 32.

The square root of 18423419 is about 4292.2510411205. The cubic root of 18423419 is about 264.1131813065.

The spelling of 18423419 in words is "eighteen million, four hundred twenty-three thousand, four hundred nineteen".