2656340 has 12 divisors (see below), whose sum is σ = 5578356. Its totient is φ = 1062528.

The previous prime is 2656337. The next prime is 2656351. The reversal of 2656340 is 436562.

It can be written as a sum of positive squares in 2 ways, for example, as 662596 + 1993744 = 814^2 + 1412^2 .

It is a super-2 number, since 2×2656340² = 14112284391200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66389 + ... + 66428.

It is an arithmetic number, because the mean of its divisors is an integer number (464863).

2^2656340 is an apocalyptic number.

2656340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2656340 is an abundant number, since it is smaller than the sum of its proper divisors (2922016).

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

2656340 is a wasteful number, since it uses less digits than its factorization.

2656340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132826 (or 132824 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 2656340 is about 1629.8282118064. The cubic root of 2656340 is about 138.4930205400.

The spelling of 2656340 in words is "two million, six hundred fifty-six thousand, three hundred forty".