2643996 has 12 divisors (see below), whose sum is σ = 6169352. Its totient is φ = 881328.

The previous prime is 2643989. The next prime is 2644003. The reversal of 2643996 is 6993462.

2643996 = 155² + 156² + ... + 226².

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2643989) and next prime (2644003).

It is a tau number, because it is divible by the number of its divisors (12).

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110155 + ... + 110178.

2^2643996 is an apocalyptic number.

It is an amenable number.

2643996 is an abundant number, since it is smaller than the sum of its proper divisors (3525356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2643996 is a wasteful number, since it uses less digits than its factorization.

2643996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220340 (or 220338 counting only the distinct ones).

The product of its digits is 69984, while the sum is 39.

The square root of 2643996 is about 1626.0368999503. The cubic root of 2643996 is about 138.2781618992.

The spelling of 2643996 in words is "two million, six hundred forty-three thousand, nine hundred ninety-six".