2645866 has 16 divisors (see below), whose sum is σ = 4098600. Its totient is φ = 1280448.

The previous prime is 2645861. The next prime is 2645879. The reversal of 2645866 is 6685462.

It can be written as a sum of positive squares in 4 ways, for example, as 2627641 + 18225 = 1621^2 + 135^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11440 + ... + 11668.

2^2645866 is an apocalyptic number.

2645866 is a deficient number, since it is larger than the sum of its proper divisors (1452734).

2645866 is a wasteful number, since it uses less digits than its factorization.

2645866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393.

The product of its digits is 69120, while the sum is 37.

The square root of 2645866 is about 1626.6118160151. The cubic root of 2645866 is about 138.3107538831.

The spelling of 2645866 in words is "two million, six hundred forty-five thousand, eight hundred sixty-six".