4002440 has 64 divisors (see below), whose sum is σ = 9979200. Its totient is φ = 1435392.

The previous prime is 4002431. The next prime is 4002457. The reversal of 4002440 is 442004.

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, 22271 + ... + 22449.

It is an arithmetic number, because the mean of its divisors is an integer number (155925).

Almost surely, 2^4002440 is an apocalyptic number.

4002440 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 4002440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4989600).

4002440 is an abundant number, since it is smaller than the sum of its proper divisors (5976760).

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

4002440 is a wasteful number, since it uses less digits than its factorization.

4002440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 4002440 is about 2000.6099070034. The cubic root of 4002440 is about 158.7723757907.

Adding to 4002440 its reverse (442004), we get a palindrome (4444444).

The spelling of 4002440 in words is "four million, two thousand, four hundred forty".