2643939 has 12 divisors (see below), whose sum is σ = 3836976. Its totient is φ = 1754352.

The previous prime is 2643917. The next prime is 2643943. The reversal of 2643939 is 9393462.

It is a happy number.

2643939 is a `hidden beast` number, since 2 + 643 + 9 + 3 + 9 = 666.

It is not a de Polignac number, because 2643939 - 2⁹ = 2643427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2643989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1809 + ... + 2925.

It is an arithmetic number, because the mean of its divisors is an integer number (319748).

2^2643939 is an apocalyptic number.

2643939 is a deficient number, since it is larger than the sum of its proper divisors (1193037).

2643939 is a wasteful number, since it uses less digits than its factorization.

2643939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386 (or 1383 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 2643939 is about 1626.0193725783. The cubic root of 2643939 is about 138.2771682124.

The spelling of 2643939 in words is "two million, six hundred forty-three thousand, nine hundred thirty-nine".