18919079 has 8 divisors (see below), whose sum is σ = 21086640. Its totient is φ = 16868736.

The previous prime is 18919067. The next prime is 18919091. The reversal of 18919079 is 97091981.

It is an interprime number because it is at equal distance from previous prime (18919067) and next prime (18919091).

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

It is a cyclic number.

It is not a de Polignac number, because 18919079 - 2²⁴ = 2141863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18919379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28964 + ... + 29609.

It is an arithmetic number, because the mean of its divisors is an integer number (2635830).

Almost surely, 2^18919079 is an apocalyptic number.

18919079 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18919079 is a deficient number, since it is larger than the sum of its proper divisors (2167561).

18919079 is a wasteful number, since it uses less digits than its factorization.

18919079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58609.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 18919079 is about 4349.6067638351. The cubic root of 18919079 is about 266.4608017047.

The spelling of 18919079 in words is "eighteen million, nine hundred nineteen thousand, seventy-nine".