4099440 has 160 divisors (see below), whose sum is σ = 14284800. Its totient is φ = 967680.

The previous prime is 4099369. The next prime is 4099441. The reversal of 4099440 is 449904.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 4099398 and 4099407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4099441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132225 + ... + 132255.

It is an arithmetic number, because the mean of its divisors is an integer number (89280).

Almost surely, 2^4099440 is an apocalyptic number.

4099440 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 4099440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7142400).

4099440 is an abundant number, since it is smaller than the sum of its proper divisors (10185360).

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

4099440 is a wasteful number, since it uses less digits than its factorization.

4099440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 4099440 is about 2024.7073862660. The cubic root of 4099440 is about 160.0447791332.

The spelling of 4099440 in words is "four million, ninety-nine thousand, four hundred forty".