19879499 has 2 divisors, whose sum is σ = 19879500. Its totient is φ = 19879498.

The previous prime is 19879487. The next prime is 19879501. The reversal of 19879499 is 99497891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19879499 is a prime.

Together with 19879501, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19879439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9939749 + 9939750.

It is an arithmetic number, because the mean of its divisors is an integer number (9939750).

Almost surely, 2^19879499 is an apocalyptic number.

19879499 is a deficient number, since it is larger than the sum of its proper divisors (1).

19879499 is an equidigital number, since it uses as much as digits as its factorization.

19879499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 56.

The square root of 19879499 is about 4458.6431792643. The cubic root of 19879499 is about 270.8955130658.

It can be divided in two parts, 198 and 79499, that added together give a palindrome (79697).

The spelling of 19879499 in words is "nineteen million, eight hundred seventy-nine thousand, four hundred ninety-nine".