4405840 has 20 divisors (see below), whose sum is σ = 10243764. Its totient is φ = 1762304.

The previous prime is 4405831. The next prime is 4405867. The reversal of 4405840 is 485044.

It can be written as a sum of positive squares in 2 ways, for example, as 3069504 + 1336336 = 1752^2 + 1156^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×4405840² = 38822852211200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27457 + ... + 27616.

Almost surely, 2^4405840 is an apocalyptic number.

4405840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4405840 is an abundant number, since it is smaller than the sum of its proper divisors (5837924).

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

4405840 is a wasteful number, since it uses less digits than its factorization.

4405840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55086 (or 55080 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 4405840 is about 2099.0092901176. The cubic root of 4405840 is about 163.9367195876.

The spelling of 4405840 in words is "four million, four hundred five thousand, eight hundred forty".