19397739572 has 12 divisors (see below), whose sum is σ = 34012739460. Its totient is φ = 9679814016.

The previous prime is 19397739509. The next prime is 19397739631. The reversal of 19397739572 is 27593779391.

It can be written as a sum of positive squares in 2 ways, for example, as 10327843876 + 9069895696 = 101626^2 + 95236^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4761653 + ... + 4765724.

It is an arithmetic number, because the mean of its divisors is an integer number (2834394955).

Almost surely, 2^19397739572 is an apocalyptic number.

It is an amenable number.

19397739572 is a deficient number, since it is larger than the sum of its proper divisors (14614999888).

19397739572 is a wasteful number, since it uses less digits than its factorization.

19397739572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9527890 (or 9527888 counting only the distinct ones).

The product of its digits is 22504230, while the sum is 62.

The spelling of 19397739572 in words is "nineteen billion, three hundred ninety-seven million, seven hundred thirty-nine thousand, five hundred seventy-two".