19900679 has 2 divisors, whose sum is σ = 19900680. Its totient is φ = 19900678.

The previous prime is 19900663. The next prime is 19900691. The reversal of 19900679 is 97600991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19900679 - 2⁴ = 19900663 is a prime.

It is a super-2 number, since 2×19900679² = 792074049322082, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19900379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950339 + 9950340.

It is an arithmetic number, because the mean of its divisors is an integer number (9950340).

Almost surely, 2^19900679 is an apocalyptic number.

19900679 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900679 is an equidigital number, since it uses as much as digits as its factorization.

19900679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 19900679 is about 4461.0177089987. The cubic root of 19900679 is about 270.9916846802.

The spelling of 19900679 in words is "nineteen million, nine hundred thousand, six hundred seventy-nine".