2628921 has 4 divisors (see below), whose sum is σ = 3505232. Its totient is φ = 1752612.

The previous prime is 2628919. The next prime is 2628953. The reversal of 2628921 is 1298262.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2628921 - 2¹ = 2628919 is a prime.

It is a super-2 number, since 2×2628921² = 13822451248482, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2628911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438151 + ... + 438156.

It is an arithmetic number, because the mean of its divisors is an integer number (876308).

2^2628921 is an apocalyptic number.

It is an amenable number.

2628921 is a deficient number, since it is larger than the sum of its proper divisors (876311).

2628921 is an equidigital number, since it uses as much as digits as its factorization.

2628921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876310.

The product of its digits is 3456, while the sum is 30.

The square root of 2628921 is about 1621.3947699435. The cubic root of 2628921 is about 138.0148587235.

The spelling of 2628921 in words is "two million, six hundred twenty-eight thousand, nine hundred twenty-one".