19979759 has 2 divisors, whose sum is σ = 19979760. Its totient is φ = 19979758.

The previous prime is 19979737. The next prime is 19979761. The reversal of 19979759 is 95797991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19979759 - 2⁸ = 19979503 is a prime.

Together with 19979761, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19979059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9989879 + 9989880.

It is an arithmetic number, because the mean of its divisors is an integer number (9989880).

Almost surely, 2^19979759 is an apocalyptic number.

19979759 is a deficient number, since it is larger than the sum of its proper divisors (1).

19979759 is an equidigital number, since it uses as much as digits as its factorization.

19979759 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1607445, while the sum is 56.

The square root of 19979759 is about 4469.8723695426. The cubic root of 19979759 is about 271.3501598724.

The spelling of 19979759 in words is "nineteen million, nine hundred seventy-nine thousand, seven hundred fifty-nine".