18391142 has 32 divisors (see below), whose sum is σ = 34594560. Its totient is φ = 7123680.

The previous prime is 18391129. The next prime is 18391151. The reversal of 18391142 is 24119381.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47084 + ... + 47472.

It is an arithmetic number, because the mean of its divisors is an integer number (1081080).

Almost surely, 2^18391142 is an apocalyptic number.

18391142 is a deficient number, since it is larger than the sum of its proper divisors (16203418).

18391142 is a wasteful number, since it uses less digits than its factorization.

18391142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716.

The product of its digits is 1728, while the sum is 29.

The square root of 18391142 is about 4288.4894776599. The cubic root of 18391142 is about 263.9588530148.

The spelling of 18391142 in words is "eighteen million, three hundred ninety-one thousand, one hundred forty-two".