2456840 has 32 divisors (see below), whose sum is σ = 5854680. Its totient is φ = 924672.

The previous prime is 2456807. The next prime is 2456849. The reversal of 2456840 is 486542.

It can be written as a sum of positive squares in 4 ways, for example, as 1444804 + 1012036 = 1202^2 + 1006^2 .

It is not an unprimeable number, because it can be changed into a prime (2456849) 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, 1127 + ... + 2486.

2^2456840 is an apocalyptic number.

2456840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2456840 is an abundant number, since it is smaller than the sum of its proper divisors (3397840).

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

2456840 is a wasteful number, since it uses less digits than its factorization.

2456840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641 (or 3637 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 2456840 is about 1567.4310192158. The cubic root of 2456840 is about 134.9353142323.

The spelling of 2456840 in words is "two million, four hundred fifty-six thousand, eight hundred forty".