18740405393 has 2 divisors, whose sum is σ = 18740405394. Its totient is φ = 18740405392.

The previous prime is 18740405377. The next prime is 18740405399. The reversal of 18740405393 is 39350404781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18198819409 + 541585984 = 134903^2 + 23272^2 .

It is a cyclic number.

It is not a de Polignac number, because 18740405393 - 2⁴ = 18740405377 is a prime.

It is not a weakly prime, because it can be changed into another prime (18740405399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9370202696 + 9370202697.

It is an arithmetic number, because the mean of its divisors is an integer number (9370202697).

Almost surely, 2^18740405393 is an apocalyptic number.

It is an amenable number.

18740405393 is a deficient number, since it is larger than the sum of its proper divisors (1).

18740405393 is an equidigital number, since it uses as much as digits as its factorization.

18740405393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 18740405393 in words is "eighteen billion, seven hundred forty million, four hundred five thousand, three hundred ninety-three".