2173723440 has 160 divisors (see below), whose sum is σ = 7781168640. Its totient is φ = 491692032.

The previous prime is 2173723427. The next prime is 2173723463. The reversal of 2173723440 is 443273712.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156291 + ... + 169629.

It is an arithmetic number, because the mean of its divisors is an integer number (48632304).

Almost surely, 2^2173723440 is an apocalyptic number.

2173723440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2173723440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3890584320).

2173723440 is an abundant number, since it is smaller than the sum of its proper divisors (5607445200).

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

2173723440 is a wasteful number, since it uses less digits than its factorization.

2173723440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13459 (or 13453 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 33.

The square root of 2173723440 is about 46623.2070968954. The cubic root of 2173723440 is about 1295.3926528554.

The spelling of 2173723440 in words is "two billion, one hundred seventy-three million, seven hundred twenty-three thousand, four hundred forty".