2686649 has 4 divisors (see below), whose sum is σ = 3070464. Its totient is φ = 2302836.

The previous prime is 2686631. The next prime is 2686667. The reversal of 2686649 is 9466862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2686631) and next prime (2686667).

It is a cyclic number.

It is not a de Polignac number, because 2686649 - 2⁸ = 2686393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2686669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191897 + ... + 191910.

It is an arithmetic number, because the mean of its divisors is an integer number (767616).

2^2686649 is an apocalyptic number.

It is an amenable number.

2686649 is a deficient number, since it is larger than the sum of its proper divisors (383815).

2686649 is an equidigital number, since it uses as much as digits as its factorization.

2686649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383814.

The product of its digits is 124416, while the sum is 41.

The square root of 2686649 is about 1639.1000579586. The cubic root of 2686649 is about 139.0177676854.

The spelling of 2686649 in words is "two million, six hundred eighty-six thousand, six hundred forty-nine".