2402840 has 64 divisors (see below), whose sum is σ = 6082560. Its totient is φ = 846720.

The previous prime is 2402839. The next prime is 2402849. The reversal of 2402840 is 482042.

2402840 = 380² + 381² + ... + 395².

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2402849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18857 + ... + 18983.

It is an arithmetic number, because the mean of its divisors is an integer number (95040).

2^2402840 is an apocalyptic number.

2402840 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 2402840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3041280).

2402840 is an abundant number, since it is smaller than the sum of its proper divisors (3679720).

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

2402840 is a wasteful number, since it uses less digits than its factorization.

2402840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 2402840 is about 1550.1096735393. The cubic root of 2402840 is about 133.9393800208.

Adding to 2402840 its reverse (482042), we get a palindrome (2884882).

The spelling of 2402840 in words is "two million, four hundred two thousand, eight hundred forty".