19699739 has 2 divisors, whose sum is σ = 19699740. Its totient is φ = 19699738.

The previous prime is 19699727. The next prime is 19699763. The reversal of 19699739 is 93799691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19699739 - 2⁸ = 19699483 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19699709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9849869 + 9849870.

It is an arithmetic number, because the mean of its divisors is an integer number (9849870).

Almost surely, 2^19699739 is an apocalyptic number.

19699739 is a deficient number, since it is larger than the sum of its proper divisors (1).

19699739 is an equidigital number, since it uses as much as digits as its factorization.

19699739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 826686, while the sum is 53.

The square root of 19699739 is about 4438.4388021015. The cubic root of 19699739 is about 270.0765169507.

The spelling of 19699739 in words is "nineteen million, six hundred ninety-nine thousand, seven hundred thirty-nine".