19994413 has 2 divisors, whose sum is σ = 19994414. Its totient is φ = 19994412.

The previous prime is 19994407. The next prime is 19994449. The reversal of 19994413 is 31449991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11682724 + 8311689 = 3418^2 + 2883^2 .

It is an emirp because it is prime and its reverse (31449991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19994413 - 2⁹ = 19993901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19994113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9997206 + 9997207.

It is an arithmetic number, because the mean of its divisors is an integer number (9997207).

Almost surely, 2^19994413 is an apocalyptic number.

It is an amenable number.

19994413 is a deficient number, since it is larger than the sum of its proper divisors (1).

19994413 is an equidigital number, since it uses as much as digits as its factorization.

19994413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 40.

The square root of 19994413 is about 4471.5112657803. The cubic root of 19994413 is about 271.4164835535.

The spelling of 19994413 in words is "nineteen million, nine hundred ninety-four thousand, four hundred thirteen".