19813799 has 2 divisors, whose sum is σ = 19813800. Its totient is φ = 19813798.

The previous prime is 19813769. The next prime is 19813819. The reversal of 19813799 is 99731891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19813799 - 2⁸ = 19813543 is a prime.

It is a super-3 number, since 3×19813799³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19813769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9906899 + 9906900.

It is an arithmetic number, because the mean of its divisors is an integer number (9906900).

Almost surely, 2^19813799 is an apocalyptic number.

19813799 is a deficient number, since it is larger than the sum of its proper divisors (1).

19813799 is an equidigital number, since it uses as much as digits as its factorization.

19813799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 47.

The square root of 19813799 is about 4451.2693695170. The cubic root of 19813799 is about 270.5967550664.

The spelling of 19813799 in words is "nineteen million, eight hundred thirteen thousand, seven hundred ninety-nine".