19445893399 has 2 divisors, whose sum is σ = 19445893400. Its totient is φ = 19445893398.

The previous prime is 19445893381. The next prime is 19445893451. The reversal of 19445893399 is 99339854491.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19445893399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19445893399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19445893339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9722946699 + 9722946700.

It is an arithmetic number, because the mean of its divisors is an integer number (9722946700).

Almost surely, 2^19445893399 is an apocalyptic number.

19445893399 is a deficient number, since it is larger than the sum of its proper divisors (1).

19445893399 is an equidigital number, since it uses as much as digits as its factorization.

19445893399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37791360, while the sum is 64.

The spelling of 19445893399 in words is "nineteen billion, four hundred forty-five million, eight hundred ninety-three thousand, three hundred ninety-nine".