19899679 has 2 divisors, whose sum is σ = 19899680. Its totient is φ = 19899678.

The previous prime is 19899653. The next prime is 19899689. The reversal of 19899679 is 97699891.

It is a strong prime.

It is an emirp because it is prime and its reverse (97699891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19899679 - 2²¹ = 17802527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19899629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9949839 + 9949840.

It is an arithmetic number, because the mean of its divisors is an integer number (9949840).

Almost surely, 2^19899679 is an apocalyptic number.

19899679 is a deficient number, since it is larger than the sum of its proper divisors (1).

19899679 is an equidigital number, since it uses as much as digits as its factorization.

19899679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 58.

The square root of 19899679 is about 4460.9056255429. The cubic root of 19899679 is about 270.9871455348.

The spelling of 19899679 in words is "nineteen million, eight hundred ninety-nine thousand, six hundred seventy-nine".