2668921 has 8 divisors (see below), whose sum is σ = 2794824. Its totient is φ = 2545920.

The previous prime is 2668909. The next prime is 2668931. The reversal of 2668921 is 1298662.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 739600 + 1929321 = 860^2 + 1389^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2668921 - 2⁵ = 2668889 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2668931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1281 + ... + 2641.

It is an arithmetic number, because the mean of its divisors is an integer number (349353).

2^2668921 is an apocalyptic number.

It is an amenable number.

2668921 is a deficient number, since it is larger than the sum of its proper divisors (125903).

2668921 is a wasteful number, since it uses less digits than its factorization.

2668921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451.

The product of its digits is 10368, while the sum is 34.

The square root of 2668921 is about 1633.6832618350. The cubic root of 2668921 is about 138.7113205496.

The spelling of 2668921 in words is "two million, six hundred sixty-eight thousand, nine hundred twenty-one".