18117942 has 8 divisors (see below), whose sum is σ = 36235896. Its totient is φ = 6039312.

The previous prime is 18117923. The next prime is 18117959. The reversal of 18117942 is 24971181.

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

18117942 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1509823 + ... + 1509834.

It is an arithmetic number, because the mean of its divisors is an integer number (4529487).

Almost surely, 2^18117942 is an apocalyptic number.

18117942 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.

18117942 is a wasteful number, since it uses less digits than its factorization.

18117942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3019662.

The product of its digits is 4032, while the sum is 33.

The square root of 18117942 is about 4256.5175907072. The cubic root of 18117942 is about 262.6452928087.

The spelling of 18117942 in words is "eighteen million, one hundred seventeen thousand, nine hundred forty-two".