2649866 has 8 divisors (see below), whose sum is σ = 4082340. Its totient is φ = 1289088.

The previous prime is 2649863. The next prime is 2649869. The reversal of 2649866 is 6689462.

It is an interprime number because it is at equal distance from previous prime (2649863) and next prime (2649869).

It can be written as a sum of positive squares in 2 ways, for example, as 2512225 + 137641 = 1585^2 + 371^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2649863) 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, 17831 + ... + 17978.

2^2649866 is an apocalyptic number.

2649866 is a deficient number, since it is larger than the sum of its proper divisors (1432474).

2649866 is a wasteful number, since it uses less digits than its factorization.

2649866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35848.

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

The square root of 2649866 is about 1627.8409013168. The cubic root of 2649866 is about 138.3804178360.

The spelling of 2649866 in words is "two million, six hundred forty-nine thousand, eight hundred sixty-six".