18977794 has 8 divisors (see below), whose sum is σ = 31054608. Its totient is φ = 8626260.

The previous prime is 18977773. The next prime is 18977813. The reversal of 18977794 is 49777981.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431292 + ... + 431335.

It is an arithmetic number, because the mean of its divisors is an integer number (3881826).

Almost surely, 2^18977794 is an apocalyptic number.

18977794 is a deficient number, since it is larger than the sum of its proper divisors (12076814).

18977794 is a wasteful number, since it uses less digits than its factorization.

18977794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862640.

The product of its digits is 889056, while the sum is 52.

The square root of 18977794 is about 4356.3509959598. The cubic root of 18977794 is about 266.7361690365.

The spelling of 18977794 in words is "eighteen million, nine hundred seventy-seven thousand, seven hundred ninety-four".