18819379 has 4 divisors (see below), whose sum is σ = 18841576. Its totient is φ = 18797184.

The previous prime is 18819377. The next prime is 18819389. The reversal of 18819379 is 97391881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97391881 = 37 ⋅2632213.

It is a cyclic number.

It is not a de Polignac number, because 18819379 - 2¹ = 18819377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18819371) by changing a digit.

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, 9774 + ... + 11539.

It is an arithmetic number, because the mean of its divisors is an integer number (4710394).

Almost surely, 2^18819379 is an apocalyptic number.

18819379 is a deficient number, since it is larger than the sum of its proper divisors (22197).

18819379 is an equidigital number, since it uses as much as digits as its factorization.

18819379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22196.

The product of its digits is 108864, while the sum is 46.

The square root of 18819379 is about 4338.1308186822. The cubic root of 18819379 is about 265.9919109229.

The spelling of 18819379 in words is "eighteen million, eight hundred nineteen thousand, three hundred seventy-nine".