19440507893 has 2 divisors, whose sum is σ = 19440507894. Its totient is φ = 19440507892.

The previous prime is 19440507851. The next prime is 19440507907. The reversal of 19440507893 is 39870504491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17800095889 + 1640412004 = 133417^2 + 40502^2 .

It is a cyclic number.

It is not a de Polignac number, because 19440507893 - 2²⁰ = 19439459317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19440507293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9720253946 + 9720253947.

It is an arithmetic number, because the mean of its divisors is an integer number (9720253947).

Almost surely, 2^19440507893 is an apocalyptic number.

It is an amenable number.

19440507893 is a deficient number, since it is larger than the sum of its proper divisors (1).

19440507893 is an equidigital number, since it uses as much as digits as its factorization.

19440507893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 19440507893 in words is "nineteen billion, four hundred forty million, five hundred seven thousand, eight hundred ninety-three".