18819079 has 4 divisors (see below), whose sum is σ = 19256776. Its totient is φ = 18381384.

The previous prime is 18819061. The next prime is 18819107. The reversal of 18819079 is 97091881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18819079 - 2⁹ = 18818567 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 437653 = 18819079 / (1 + 8 + 8 + 1 + 9 + 0 + 7 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18819019) 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 3 ways as a sum of consecutive naturals, for example, 218784 + ... + 218869.

It is an arithmetic number, because the mean of its divisors is an integer number (4814194).

Almost surely, 2^18819079 is an apocalyptic number.

18819079 is a deficient number, since it is larger than the sum of its proper divisors (437697).

18819079 is an equidigital number, since it uses as much as digits as its factorization.

18819079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437696.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 18819079 is about 4338.0962414405. The cubic root of 18819079 is about 265.9904975217.

The spelling of 18819079 in words is "eighteen million, eight hundred nineteen thousand, seventy-nine".