18814431393 has 6 divisors (see below), whose sum is σ = 27176400914. Its totient is φ = 12542954256.

The previous prime is 18814431379. The next prime is 18814431407. The reversal of 18814431393 is 39313441881.

18814431393 is a `hidden beast` number, since 188 + 1 + 4 + 431 + 39 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (18814431379) and next prime (18814431407).

It can be written as a sum of positive squares in only one way, i.e., 18396310689 + 418120704 = 135633^2 + 20448^2 .

It is not a de Polignac number, because 18814431393 - 2²⁹ = 18277560481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18814421393) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1045246180 + ... + 1045246197.

Almost surely, 2^18814431393 is an apocalyptic number.

It is an amenable number.

18814431393 is a deficient number, since it is larger than the sum of its proper divisors (8361969521).

18814431393 is a wasteful number, since it uses less digits than its factorization.

18814431393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090492383 (or 2090492380 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The spelling of 18814431393 in words is "eighteen billion, eight hundred fourteen million, four hundred thirty-one thousand, three hundred ninety-three".