18399442 has 8 divisors (see below), whose sum is σ = 28241136. Its totient is φ = 8985732.

The previous prime is 18399421. The next prime is 18399443. The reversal of 18399442 is 24499381.

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

It is a super-2 number, since 2×18399442² = 677078931822728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18399395 and 18399404.

It is not an unprimeable number, because it can be changed into a prime (18399443) 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, 106888 + ... + 107059.

It is an arithmetic number, because the mean of its divisors is an integer number (3530142).

Almost surely, 2^18399442 is an apocalyptic number.

18399442 is a deficient number, since it is larger than the sum of its proper divisors (9841694).

18399442 is a wasteful number, since it uses less digits than its factorization.

18399442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213992.

The product of its digits is 62208, while the sum is 40.

The square root of 18399442 is about 4289.4570752019. The cubic root of 18399442 is about 263.9985556242.

The spelling of 18399442 in words is "eighteen million, three hundred ninety-nine thousand, four hundred forty-two".