19493869 has 2 divisors, whose sum is σ = 19493870. Its totient is φ = 19493868.

The previous prime is 19493839. The next prime is 19493893. The reversal of 19493869 is 96839491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16892100 + 2601769 = 4110^2 + 1613^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19493869 is a prime.

It is a super-2 number, since 2×19493869² = 760021857178322, 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 (19493839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9746934 + 9746935.

It is an arithmetic number, because the mean of its divisors is an integer number (9746935).

Almost surely, 2^19493869 is an apocalyptic number.

It is an amenable number.

19493869 is a deficient number, since it is larger than the sum of its proper divisors (1).

19493869 is an equidigital number, since it uses as much as digits as its factorization.

19493869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 49.

The square root of 19493869 is about 4415.1861795399. The cubic root of 19493869 is about 269.1324186932.

The spelling of 19493869 in words is "nineteen million, four hundred ninety-three thousand, eight hundred sixty-nine".