18221342 has 8 divisors (see below), whose sum is σ = 28770600. Its totient is φ = 8631144.

The previous prime is 18221341. The next prime is 18221389. The reversal of 18221342 is 24312281.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18221341) 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, 239717 + ... + 239792.

It is an arithmetic number, because the mean of its divisors is an integer number (3596325).

Almost surely, 2^18221342 is an apocalyptic number.

18221342 is a deficient number, since it is larger than the sum of its proper divisors (10549258).

18221342 is a wasteful number, since it uses less digits than its factorization.

18221342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479530.

The product of its digits is 768, while the sum is 23.

The square root of 18221342 is about 4268.6463896650. The cubic root of 18221342 is about 263.1439885831.

The spelling of 18221342 in words is "eighteen million, two hundred twenty-one thousand, three hundred forty-two".