2628421 has 4 divisors (see below), whose sum is σ = 2783052. Its totient is φ = 2473792.

The previous prime is 2628407. The next prime is 2628481. The reversal of 2628421 is 1248262.

It is a happy number.

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 1028196 + 1600225 = 1014^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 2628421 - 2¹⁵ = 2595653 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 (2628401) 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, 77290 + ... + 77323.

It is an arithmetic number, because the mean of its divisors is an integer number (695763).

2^2628421 is an apocalyptic number.

It is an amenable number.

2628421 is a deficient number, since it is larger than the sum of its proper divisors (154631).

2628421 is a wasteful number, since it uses less digits than its factorization.

2628421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154630.

The product of its digits is 1536, while the sum is 25.

The square root of 2628421 is about 1621.2405743751. The cubic root of 2628421 is about 138.0061083903.

The spelling of 2628421 in words is "two million, six hundred twenty-eight thousand, four hundred twenty-one".