2686621 has 6 divisors (see below), whose sum is σ = 3125310. Its totient is φ = 2302776.

The previous prime is 2686603. The next prime is 2686631. The reversal of 2686621 is 1266862.

It can be written as a sum of positive squares in only one way, i.e., 1920996 + 765625 = 1386^2 + 875^2 .

It is not a de Polignac number, because 2686621 - 2¹⁷ = 2555549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2686631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27366 + ... + 27463.

It is an arithmetic number, because the mean of its divisors is an integer number (520885).

2^2686621 is an apocalyptic number.

It is an amenable number.

2686621 is a deficient number, since it is larger than the sum of its proper divisors (438689).

2686621 is an equidigital number, since it uses as much as digits as its factorization.

2686621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54843 (or 54836 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 2686621 is about 1639.0915166640. The cubic root of 2686621 is about 139.0172847405.

It can be divided in two parts, 268 and 6621, that added together give a square (6889 = 83²).

The spelling of 2686621 in words is "two million, six hundred eighty-six thousand, six hundred twenty-one".