18979603 has 2 divisors, whose sum is σ = 18979604. Its totient is φ = 18979602.

The previous prime is 18979591. The next prime is 18979607. The reversal of 18979603 is 30697981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18979603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18979603.

It is not a weakly prime, because it can be changed into another prime (18979607) 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 as a sum of consecutive naturals, namely, 9489801 + 9489802.

It is an arithmetic number, because the mean of its divisors is an integer number (9489802).

Almost surely, 2^18979603 is an apocalyptic number.

18979603 is a deficient number, since it is larger than the sum of its proper divisors (1).

18979603 is an equidigital number, since it uses as much as digits as its factorization.

18979603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 18979603 is about 4356.5586189101. The cubic root of 18979603 is about 266.7446440363.

The spelling of 18979603 in words is "eighteen million, nine hundred seventy-nine thousand, six hundred three".