19904413 has 2 divisors, whose sum is σ = 19904414. Its totient is φ = 19904412.

The previous prime is 19904377. The next prime is 19904429. The reversal of 19904413 is 31440991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14273284 + 5631129 = 3778^2 + 2373^2 .

It is a cyclic number.

It is not a de Polignac number, because 19904413 - 2¹³ = 19896221 is a prime.

It is equal to p_1264873 and since 19904413 and 1264873 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19904473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9952206 + 9952207.

It is an arithmetic number, because the mean of its divisors is an integer number (9952207).

Almost surely, 2^19904413 is an apocalyptic number.

It is an amenable number.

19904413 is a deficient number, since it is larger than the sum of its proper divisors (1).

19904413 is an equidigital number, since it uses as much as digits as its factorization.

19904413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 19904413 is about 4461.4362037353. The cubic root of 19904413 is about 271.0086325051.

The spelling of 19904413 in words is "nineteen million, nine hundred four thousand, four hundred thirteen".