19994279 has 2 divisors, whose sum is σ = 19994280. Its totient is φ = 19994278.

The previous prime is 19994267. The next prime is 19994281. The reversal of 19994279 is 97249991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19994279 is a prime.

Together with 19994281, 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 (19994879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9997139 + 9997140.

It is an arithmetic number, because the mean of its divisors is an integer number (9997140).

Almost surely, 2^19994279 is an apocalyptic number.

19994279 is a deficient number, since it is larger than the sum of its proper divisors (1).

19994279 is an equidigital number, since it uses as much as digits as its factorization.

19994279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 50.

The square root of 19994279 is about 4471.4962820067. The cubic root of 19994279 is about 271.4158772193.

The spelling of 19994279 in words is "nineteen million, nine hundred ninety-four thousand, two hundred seventy-nine".