18917942 has 8 divisors (see below), whose sum is σ = 28398216. Its totient is φ = 9451872.

The previous prime is 18917917. The next prime is 18917959. The reversal of 18917942 is 24971981.

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

It is a super-3 number, since 3×18917942³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18917942.

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, 893 + ... + 6215.

It is an arithmetic number, because the mean of its divisors is an integer number (3549777).

Almost surely, 2^18917942 is an apocalyptic number.

18917942 is a deficient number, since it is larger than the sum of its proper divisors (9480274).

18917942 is a wasteful number, since it uses less digits than its factorization.

18917942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7102.

The product of its digits is 36288, while the sum is 41.

The square root of 18917942 is about 4349.4760604008. The cubic root of 18917942 is about 266.4554636718.

The spelling of 18917942 in words is "eighteen million, nine hundred seventeen thousand, nine hundred forty-two".