18209142 has 48 divisors (see below), whose sum is σ = 47747232. Its totient is φ = 4896000.

The previous prime is 18209137. The next prime is 18209161. The reversal of 18209142 is 24190281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2109 + ... + 6392.

It is an arithmetic number, because the mean of its divisors is an integer number (994734).

Almost surely, 2^18209142 is an apocalyptic number.

18209142 is an abundant number, since it is smaller than the sum of its proper divisors (29538090).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18209142 is a wasteful number, since it uses less digits than its factorization.

18209142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8533 (or 8530 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 18209142 is about 4267.2171259499. The cubic root of 18209142 is about 263.0852465976.

The spelling of 18209142 in words is "eighteen million, two hundred nine thousand, one hundred forty-two".