2643990 has 32 divisors (see below), whose sum is σ = 6552576. Its totient is φ = 682080.

The previous prime is 2643989. The next prime is 2644003. The reversal of 2643990 is 993462.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 492 + ... + 2351.

It is an arithmetic number, because the mean of its divisors is an integer number (204768).

2^2643990 is an apocalyptic number.

2643990 is an abundant number, since it is smaller than the sum of its proper divisors (3908586).

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

2643990 is a wasteful number, since it uses less digits than its factorization.

2643990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 2643990 is about 1626.0350549727. The cubic root of 2643990 is about 138.2780573012.

The spelling of 2643990 in words is "two million, six hundred forty-three thousand, nine hundred ninety".