2173722939 has 64 divisors (see below), whose sum is σ = 3434296320. Its totient is φ = 1356030720.

The previous prime is 2173722919. The next prime is 2173722961. The reversal of 2173722939 is 9392273712.

It is a happy number.

It is not a de Polignac number, because 2173722939 - 2²¹ = 2171625787 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2173722894 and 2173722903.

It is not an unprimeable number, because it can be changed into a prime (2173722919) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9329167 + ... + 9329399.

It is an arithmetic number, because the mean of its divisors is an integer number (53660880).

Almost surely, 2^2173722939 is an apocalyptic number.

2173722939 is a deficient number, since it is larger than the sum of its proper divisors (1260573381).

2173722939 is a wasteful number, since it uses less digits than its factorization.

2173722939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529 (or 523 counting only the distinct ones).

The product of its digits is 285768, while the sum is 45.

The square root of 2173722939 is about 46623.2017240344. The cubic root of 2173722939 is about 1295.3925533347.

The spelling of 2173722939 in words is "two billion, one hundred seventy-three million, seven hundred twenty-two thousand, nine hundred thirty-nine".