2921999 has 4 divisors (see below), whose sum is σ = 2939664. Its totient is φ = 2904336.

The previous prime is 2921987. The next prime is 2922041. The reversal of 2921999 is 9991292.

2921999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2921999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2921929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8582 + ... + 8915.

It is an arithmetic number, because the mean of its divisors is an integer number (734916).

2^2921999 is an apocalyptic number.

2921999 is a deficient number, since it is larger than the sum of its proper divisors (17665).

2921999 is a wasteful number, since it uses less digits than its factorization.

2921999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17664.

The product of its digits is 26244, while the sum is 41.

The square root of 2921999 is about 1709.3855621246. The cubic root of 2921999 is about 142.9639989573.

The spelling of 2921999 in words is "two million, nine hundred twenty-one thousand, nine hundred ninety-nine".