18979790 has 8 divisors (see below), whose sum is σ = 34163640. Its totient is φ = 7591912.

The previous prime is 18979787. The next prime is 18979801. The reversal of 18979790 is 9797981.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 948980 + ... + 948999.

It is an arithmetic number, because the mean of its divisors is an integer number (4270455).

Almost surely, 2^18979790 is an apocalyptic number.

18979790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18979790 is a deficient number, since it is larger than the sum of its proper divisors (15183850).

18979790 is a wasteful number, since it uses less digits than its factorization.

18979790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1897986.

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 18979790 is about 4356.5800807514. The cubic root of 18979790 is about 266.7455200835.

The spelling of 18979790 in words is "eighteen million, nine hundred seventy-nine thousand, seven hundred ninety".