2686440 has 64 divisors (see below), whose sum is σ = 8213760. Its totient is φ = 702720.

The previous prime is 2686393. The next prime is 2686451. The reversal of 2686440 is 446862.

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 = 2686398 and 2686407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7137 + ... + 7503.

It is an arithmetic number, because the mean of its divisors is an integer number (128340).

2^2686440 is an apocalyptic number.

2686440 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 2686440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4106880).

2686440 is an abundant number, since it is smaller than the sum of its proper divisors (5527320).

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

2686440 is a wasteful number, since it uses less digits than its factorization.

2686440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442 (or 438 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 2686440 is about 1639.0363022215. The cubic root of 2686440 is about 139.0141627651.

The spelling of 2686440 in words is "two million, six hundred eighty-six thousand, four hundred forty".