2990921 has 4 divisors (see below), whose sum is σ = 3006612. Its totient is φ = 2975232.

The previous prime is 2990917. The next prime is 2990927. The reversal of 2990921 is 1290992.

2990921 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 can be written as a sum of positive squares in 2 ways, for example, as 1990921 + 1000000 = 1411^2 + 1000^2 .

It is a cyclic number.

It is not a de Polignac number, because 2990921 - 2² = 2990917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2990927) 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, 7556 + ... + 7941.

It is an arithmetic number, because the mean of its divisors is an integer number (751653).

2^2990921 is an apocalyptic number.

It is an amenable number.

2990921 is a deficient number, since it is larger than the sum of its proper divisors (15691).

2990921 is a wasteful number, since it uses less digits than its factorization.

2990921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15690.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 2990921 is about 1729.4279401004. The cubic root of 2990921 is about 144.0793190838.

The spelling of 2990921 in words is "two million, nine hundred ninety thousand, nine hundred twenty-one".