2646646 has 4 divisors (see below), whose sum is σ = 3969972. Its totient is φ = 1323322.

The previous prime is 2646641. The next prime is 2646649. The reversal of 2646646 is 6466462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6466462 = 2 ⋅3233231.

It is a super-4 number, since 4×2646646⁴ (a number of 27 digits) contains 4444 as substring.

It is an Ulam number.

It is a congruent 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 as a sum of consecutive naturals, namely, 661660 + ... + 661663.

It is an arithmetic number, because the mean of its divisors is an integer number (992493).

2^2646646 is an apocalyptic number.

2646646 is a deficient number, since it is larger than the sum of its proper divisors (1323326).

2646646 is a wasteful number, since it uses less digits than its factorization.

2646646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323325.

The product of its digits is 41472, while the sum is 34.

The square root of 2646646 is about 1626.8515605303. The cubic root of 2646646 is about 138.3243438619.

The spelling of 2646646 in words is "two million, six hundred forty-six thousand, six hundred forty-six".