2173440 has 80 divisors (see below), whose sum is σ = 6972768. Its totient is φ = 577536.

The previous prime is 2173411. The next prime is 2173447. The reversal of 2173440 is 443712.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (2173447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7539 + ... + 7821.

2^2173440 is an apocalyptic number.

2173440 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 2173440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3486384).

2173440 is an abundant number, since it is smaller than the sum of its proper divisors (4799328).

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

2173440 is an equidigital number, since it uses as much as digits as its factorization.

2173440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 2173440 is about 1474.2591359730. The cubic root of 2173440 is about 129.5336346696.

The spelling of 2173440 in words is "two million, one hundred seventy-three thousand, four hundred forty".