19699929 has 10 divisors (see below), whose sum is σ = 29428410. Its totient is φ = 13133232.

The previous prime is 19699879. The next prime is 19699951. The reversal of 19699929 is 92999691.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14837904 + 4862025 = 3852^2 + 2205^2 .

It is not a de Polignac number, because 19699929 - 2⁹ = 19699417 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19699969) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 121524 + ... + 121685.

It is an arithmetic number, because the mean of its divisors is an integer number (2942841).

Almost surely, 2^19699929 is an apocalyptic number.

It is an amenable number.

19699929 is a deficient number, since it is larger than the sum of its proper divisors (9728481).

19699929 is an equidigital number, since it uses as much as digits as its factorization.

19699929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243221 (or 243212 counting only the distinct ones).

The product of its digits is 708588, while the sum is 54.

The square root of 19699929 is about 4438.4602059723. The cubic root of 19699929 is about 270.0773852258.

The spelling of 19699929 in words is "nineteen million, six hundred ninety-nine thousand, nine hundred twenty-nine".