2045440 has 80 divisors (see below), whose sum is σ = 5303232. Its totient is φ = 753664.

The previous prime is 2045437. The next prime is 2045441. The reversal of 2045440 is 445402.

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

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2045441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43497 + ... + 43543.

2^2045440 is an apocalyptic number.

2045440 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 2045440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2651616).

2045440 is an abundant number, since it is smaller than the sum of its proper divisors (3257792).

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

2045440 is an equidigital number, since it uses as much as digits as its factorization.

2045440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 2045440 is about 1430.1887987255. The cubic root of 2045440 is about 126.9391487265.

It can be divided in two parts, 2045 and 440, that added together give a triangular number (2485 = T₇₀).

The spelling of 2045440 in words is "two million, forty-five thousand, four hundred forty".