18442642 has 8 divisors (see below), whose sum is σ = 28866816. Its totient is φ = 8820372.

The previous prime is 18442639. The next prime is 18442663. The reversal of 18442642 is 24624481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200418 + ... + 200509.

It is an arithmetic number, because the mean of its divisors is an integer number (3608352).

Almost surely, 2^18442642 is an apocalyptic number.

18442642 is a deficient number, since it is larger than the sum of its proper divisors (10424174).

18442642 is a wasteful number, since it uses less digits than its factorization.

18442642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400952.

The product of its digits is 12288, while the sum is 31.

The square root of 18442642 is about 4294.4897252177. The cubic root of 18442642 is about 264.2050079631.

The spelling of 18442642 in words is "eighteen million, four hundred forty-two thousand, six hundred forty-two".