19913799 has 4 divisors (see below), whose sum is σ = 26551736. Its totient is φ = 13275864.

The previous prime is 19913779. The next prime is 19913863. The reversal of 19913799 is 99731991.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 19913799 - 2⁷ = 19913671 is a prime.

It is a super-2 number, since 2×19913799² = 793118781224802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19913779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3318964 + ... + 3318969.

It is an arithmetic number, because the mean of its divisors is an integer number (6637934).

Almost surely, 2^19913799 is an apocalyptic number.

19913799 is a deficient number, since it is larger than the sum of its proper divisors (6637937).

19913799 is an equidigital number, since it uses as much as digits as its factorization.

19913799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6637936.

The product of its digits is 137781, while the sum is 48.

The square root of 19913799 is about 4462.4879831771. The cubic root of 19913799 is about 271.0512241873.

The spelling of 19913799 in words is "nineteen million, nine hundred thirteen thousand, seven hundred ninety-nine".