18209442 has 8 divisors (see below), whose sum is σ = 36418896. Its totient is φ = 6069812.

The previous prime is 18209437. The next prime is 18209447. The reversal of 18209442 is 24490281.

It is an interprime number because it is at equal distance from previous prime (18209437) and next prime (18209447).

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

18209442 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (18209447) 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, 1517448 + ... + 1517459.

It is an arithmetic number, because the mean of its divisors is an integer number (4552362).

Almost surely, 2^18209442 is an apocalyptic number.

18209442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18209442 is a wasteful number, since it uses less digits than its factorization.

18209442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3034912.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18209442 is about 4267.2522775200. The cubic root of 18209442 is about 263.0866913873.

The spelling of 18209442 in words is "eighteen million, two hundred nine thousand, four hundred forty-two".