2991864 has 32 divisors (see below), whose sum is σ = 7920720. Its totient is φ = 938496.

The previous prime is 2991853. The next prime is 2991871. The reversal of 2991864 is 4681992.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3259 + ... + 4074.

2^2991864 is an apocalyptic number.

2991864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2991864 is an abundant number, since it is smaller than the sum of its proper divisors (4928856).

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

2991864 is a wasteful number, since it uses less digits than its factorization.

2991864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7359 (or 7355 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 2991864 is about 1729.7005521188. The cubic root of 2991864 is about 144.0944596287.

The spelling of 2991864 in words is "two million, nine hundred ninety-one thousand, eight hundred sixty-four".