2790921 has 16 divisors (see below), whose sum is σ = 4276224. Its totient is φ = 1586064.

The previous prime is 2790901. The next prime is 2790923. The reversal of 2790921 is 1290972.

It is not a de Polignac number, because 2790921 - 2⁶ = 2790857 is a prime.

It is a Curzon number.

2790921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2790923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7096 + ... + 7478.

It is an arithmetic number, because the mean of its divisors is an integer number (267264).

2^2790921 is an apocalyptic number.

2790921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2790921 is a deficient number, since it is larger than the sum of its proper divisors (1485303).

2790921 is a wasteful number, since it uses less digits than its factorization.

2790921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 2790921 is about 1670.6049802392. The cubic root of 2790921 is about 140.7934705833.

The spelling of 2790921 in words is "two million, seven hundred ninety thousand, nine hundred twenty-one".