18948979 has 16 divisors (see below), whose sum is σ = 22220800. Its totient is φ = 15824160.

The previous prime is 18948973. The next prime is 18948991. The reversal of 18948979 is 97984981.

It is a cyclic number.

It is not a de Polignac number, because 18948979 - 2⁷ = 18948851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18948973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84862 + ... + 85084.

It is an arithmetic number, because the mean of its divisors is an integer number (1388800).

Almost surely, 2^18948979 is an apocalyptic number.

18948979 is a deficient number, since it is larger than the sum of its proper divisors (3271821).

18948979 is a wasteful number, since it uses less digits than its factorization.

18948979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490.

The product of its digits is 1306368, while the sum is 55.

The square root of 18948979 is about 4353.0424992182. The cubic root of 18948979 is about 266.6011007207.

The spelling of 18948979 in words is "eighteen million, nine hundred forty-eight thousand, nine hundred seventy-nine".