4446640 has 80 divisors (see below), whose sum is σ = 11713536. Its totient is φ = 1555200.

The previous prime is 4446601. The next prime is 4446641. The reversal of 4446640 is 466444.

4446640 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 4446599 and 4446608.

It is not an unprimeable number, because it can be changed into a prime (4446641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27199 + ... + 27361.

Almost surely, 2^4446640 is an apocalyptic number.

4446640 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 4446640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5856768).

4446640 is an abundant number, since it is smaller than the sum of its proper divisors (7266896).

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

4446640 is a wasteful number, since it uses less digits than its factorization.

4446640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 4446640 is about 2108.7057642070. The cubic root of 4446640 is about 164.4412073599.

It can be divided in two parts, 4 and 446640, that added together give a palindrome (446644).

The spelling of 4446640 in words is "four million, four hundred forty-six thousand, six hundred forty".