19442692731 has 24 divisors (see below), whose sum is σ = 32565175552. Its totient is φ = 10100098800.

The previous prime is 19442692729. The next prime is 19442692751. The reversal of 19442692731 is 13729624491.

It is not a de Polignac number, because 19442692731 - 2¹ = 19442692729 is a prime.

It is a super-2 number, since 2×19442692731² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19442692751) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3823255 + ... + 3828336.

Almost surely, 2^19442692731 is an apocalyptic number.

19442692731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19442692731 is a deficient number, since it is larger than the sum of its proper divisors (13122482821).

19442692731 is a wasteful number, since it uses less digits than its factorization.

19442692731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7651623 (or 7651612 counting only the distinct ones).

The product of its digits is 653184, while the sum is 48.

The spelling of 19442692731 in words is "nineteen billion, four hundred forty-two million, six hundred ninety-two thousand, seven hundred thirty-one".