18942778 has 8 divisors (see below), whose sum is σ = 28774080. Its totient is φ = 9351420.

The previous prime is 18942769. The next prime is 18942809. The reversal of 18942778 is 87724981.

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

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, 59788 + ... + 60103.

It is an arithmetic number, because the mean of its divisors is an integer number (3596760).

Almost surely, 2^18942778 is an apocalyptic number.

18942778 is a deficient number, since it is larger than the sum of its proper divisors (9831302).

18942778 is a wasteful number, since it uses less digits than its factorization.

18942778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119972.

The product of its digits is 225792, while the sum is 46.

The square root of 18942778 is about 4352.3301804895. The cubic root of 18942778 is about 266.5720160615.

The spelling of 18942778 in words is "eighteen million, nine hundred forty-two thousand, seven hundred seventy-eight".