19789601972 has 36 divisors (see below), whose sum is σ = 41675158980. Its totient is φ = 8188798464.

The previous prime is 19789601969. The next prime is 19789601977. The reversal of 19789601972 is 27910698791.

It can be written as a sum of positive squares in 2 ways, for example, as 5675211556 + 14114390416 = 75334^2 + 118804^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19789601977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1735133 + ... + 1746500.

It is an arithmetic number, because the mean of its divisors is an integer number (1157643305).

Almost surely, 2^19789601972 is an apocalyptic number.

It is an amenable number.

19789601972 is an abundant number, since it is smaller than the sum of its proper divisors (21885557008).

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

19789601972 is a wasteful number, since it uses less digits than its factorization.

19789601972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3481680 (or 3481671 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 59.

The spelling of 19789601972 in words is "nineteen billion, seven hundred eighty-nine million, six hundred one thousand, nine hundred seventy-two".