19623413 has 2 divisors, whose sum is σ = 19623414. Its totient is φ = 19623412.

The previous prime is 19623397. The next prime is 19623419. The reversal of 19623413 is 31432691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10903204 + 8720209 = 3302^2 + 2953^2 .

It is a cyclic number.

It is not a de Polignac number, because 19623413 - 2⁴ = 19623397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19623419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9811706 + 9811707.

It is an arithmetic number, because the mean of its divisors is an integer number (9811707).

Almost surely, 2^19623413 is an apocalyptic number.

It is an amenable number.

19623413 is a deficient number, since it is larger than the sum of its proper divisors (1).

19623413 is an equidigital number, since it uses as much as digits as its factorization.

19623413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 19623413 is about 4429.8321638635. The cubic root of 19623413 is about 269.7272646034.

The spelling of 19623413 in words is "nineteen million, six hundred twenty-three thousand, four hundred thirteen".