2646643 has 4 divisors (see below), whose sum is σ = 2785960. Its totient is φ = 2507328.

The previous prime is 2646641. The next prime is 2646649. The reversal of 2646643 is 3466462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3466462 = 2 ⋅1733231.

It is a cyclic number.

It is not a de Polignac number, because 2646643 - 2¹ = 2646641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2646641) 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, 69630 + ... + 69667.

It is an arithmetic number, because the mean of its divisors is an integer number (696490).

2^2646643 is an apocalyptic number.

2646643 is a deficient number, since it is larger than the sum of its proper divisors (139317).

2646643 is a wasteful number, since it uses less digits than its factorization.

2646643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139316.

The product of its digits is 20736, while the sum is 31.

The square root of 2646643 is about 1626.8506385037. The cubic root of 2646643 is about 138.3242915979.

The spelling of 2646643 in words is "two million, six hundred forty-six thousand, six hundred forty-three".