2404240 has 40 divisors (see below), whose sum is σ = 5734008. Its totient is φ = 936960.

The previous prime is 2404229. The next prime is 2404247. The reversal of 2404240 is 424042.

It can be written as a sum of positive squares in 4 ways, for example, as 295936 + 2108304 = 544^2 + 1452^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2404247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2914 + ... + 3646.

2^2404240 is an apocalyptic number.

2404240 is a gapful number since it is divisible by the number (20) 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 2404240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2867004).

2404240 is an abundant number, since it is smaller than the sum of its proper divisors (3329768).

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

2404240 is a wasteful number, since it uses less digits than its factorization.

2404240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 2404240 is about 1550.5611887314. The cubic root of 2404240 is about 133.9653879566.

Adding to 2404240 its reverse (424042), we get a palindrome (2828282).

The spelling of 2404240 in words is "two million, four hundred four thousand, two hundred forty".