19619813140 has 24 divisors (see below), whose sum is σ = 42315166152. Its totient is φ = 7635818880.

The previous prime is 19619813123. The next prime is 19619813173. The reversal of 19619813140 is 4131891691.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1322922384 + 18296890756 = 36372^2 + 135266^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13255891 + ... + 13257370.

It is an arithmetic number, because the mean of its divisors is an integer number (1763131923).

Almost surely, 2^19619813140 is an apocalyptic number.

19619813140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19619813140 is an abundant number, since it is smaller than the sum of its proper divisors (22695353012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19619813140 is a wasteful number, since it uses less digits than its factorization.

19619813140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26513307 (or 26513305 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 43.

The spelling of 19619813140 in words is "nineteen billion, six hundred nineteen million, eight hundred thirteen thousand, one hundred forty".