19385974431 has 64 divisors (see below), whose sum is σ = 29512304640. Its totient is φ = 12574103040.

The previous prime is 19385974409. The next prime is 19385974457. The reversal of 19385974431 is 13447958391.

19385974431 is a `hidden beast` number, since 1 + 9 + 3 + 8 + 597 + 4 + 43 + 1 = 666.

It is not a de Polignac number, because 19385974431 - 2²⁶ = 19318865567 is a prime.

It is a super-2 number, since 2×19385974431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19385974481) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 71534826 + ... + 71535096.

It is an arithmetic number, because the mean of its divisors is an integer number (461129760).

Almost surely, 2^19385974431 is an apocalyptic number.

19385974431 is a deficient number, since it is larger than the sum of its proper divisors (10126330209).

19385974431 is a wasteful number, since it uses less digits than its factorization.

19385974431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733 (or 727 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 19385974431 in words is "nineteen billion, three hundred eighty-five million, nine hundred seventy-four thousand, four hundred thirty-one".