4455440 has 80 divisors (see below), whose sum is σ = 11624256. Its totient is φ = 1574400.

The previous prime is 4455403. The next prime is 4455461. The reversal of 4455440 is 445544.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53639 + ... + 53721.

Almost surely, 2^4455440 is an apocalyptic number.

4455440 is a gapful number since it is divisible by the number (40) 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 4455440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5812128).

4455440 is an abundant number, since it is smaller than the sum of its proper divisors (7168816).

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

4455440 is a wasteful number, since it uses less digits than its factorization.

4455440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 4455440 is about 2110.7913208084. The cubic root of 4455440 is about 164.5496134875.

It can be divided in two parts, 445 and 5440, that added together give a palindrome (5885).

The spelling of 4455440 in words is "four million, four hundred fifty-five thousand, four hundred forty".