19440129826 has 12 divisors (see below), whose sum is σ = 31575832722. Its totient is φ = 8972367456.

The previous prime is 19440129823. The next prime is 19440129857. The reversal of 19440129826 is 62892104491.

It can be written as a sum of positive squares in 3 ways, for example, as 13309083225 + 6131046601 = 115365^2 + 78301^2 .

It is not an unprimeable number, because it can be changed into a prime (19440129823) 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, 28757251 + ... + 28757926.

Almost surely, 2^19440129826 is an apocalyptic number.

19440129826 is a deficient number, since it is larger than the sum of its proper divisors (12135702896).

19440129826 is a wasteful number, since it uses less digits than its factorization.

19440129826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57515205 (or 57515192 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 19440129826 in words is "nineteen billion, four hundred forty million, one hundred twenty-nine thousand, eight hundred twenty-six".