2643946 has 8 divisors (see below), whose sum is σ = 4073220. Its totient is φ = 1286208.

The previous prime is 2643943. The next prime is 2643947. The reversal of 2643946 is 6493462.

It can be written as a sum of positive squares in 2 ways, for example, as 2608225 + 35721 = 1615^2 + 189^2 .

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

It is an Ulam number.

It is a d-powerful number, because it can be written as 2 + 6 + 4⁵ + 3¹³ + 9 + 4¹⁰ + 6 .

It is not an unprimeable number, because it can be changed into a prime (2643943) 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, 17791 + ... + 17938.

2^2643946 is an apocalyptic number.

2643946 is a deficient number, since it is larger than the sum of its proper divisors (1429274).

2643946 is a wasteful number, since it uses less digits than its factorization.

2643946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35768.

The product of its digits is 31104, while the sum is 34.

The square root of 2643946 is about 1626.0215250728. The cubic root of 2643946 is about 138.2772902449.

The spelling of 2643946 in words is "two million, six hundred forty-three thousand, nine hundred forty-six".