18394442 has 32 divisors (see below), whose sum is σ = 32192640. Its totient is φ = 7790080.

The previous prime is 18394429. The next prime is 18394447. The reversal of 18394442 is 24449381.

It is not an unprimeable number, because it can be changed into a prime (18394447) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 51059 + ... + 51417.

It is an arithmetic number, because the mean of its divisors is an integer number (1006020).

Almost surely, 2^18394442 is an apocalyptic number.

18394442 is a deficient number, since it is larger than the sum of its proper divisors (13798198).

18394442 is a wasteful number, since it uses less digits than its factorization.

18394442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526.

The product of its digits is 27648, while the sum is 35.

The square root of 18394442 is about 4288.8742112587. The cubic root of 18394442 is about 263.9746398198.

The spelling of 18394442 in words is "eighteen million, three hundred ninety-four thousand, four hundred forty-two".