2173905240 has 128 divisors (see below), whose sum is σ = 7156175040. Its totient is φ = 524998656.

The previous prime is 2173905229. The next prime is 2173905257. The reversal of 2173905240 is 425093712.

It is a congruent number.

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, 69534 + ... + 95826.

Almost surely, 2^2173905240 is an apocalyptic number.

2173905240 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 2173905240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3578087520).

2173905240 is an abundant number, since it is smaller than the sum of its proper divisors (4982269800).

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

2173905240 is a wasteful number, since it uses less digits than its factorization.

2173905240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26373 (or 26369 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 2173905240 is about 46625.1567289591. The cubic root of 2173905240 is about 1295.4287653640.

Adding to 2173905240 its reverse (425093712), we get a palindrome (2598998952).

The spelling of 2173905240 in words is "two billion, one hundred seventy-three million, nine hundred five thousand, two hundred forty".