2800421 has 4 divisors (see below), whose sum is σ = 3015852. Its totient is φ = 2584992.

The previous prime is 2800403. The next prime is 2800439. The reversal of 2800421 is 1240082.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2800403) and next prime (2800439).

It can be written as a sum of positive squares in 2 ways, for example, as 1876900 + 923521 = 1370^2 + 961^2 .

It is a cyclic number.

It is not a de Polignac number, because 2800421 - 2¹⁰ = 2799397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2800421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2800451) 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, 107696 + ... + 107721.

It is an arithmetic number, because the mean of its divisors is an integer number (753963).

2^2800421 is an apocalyptic number.

It is an amenable number.

2800421 is a deficient number, since it is larger than the sum of its proper divisors (215431).

2800421 is a wasteful number, since it uses less digits than its factorization.

2800421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215430.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 2800421 is about 1673.4458461510. The cubic root of 2800421 is about 140.9530383653.

The spelling of 2800421 in words is "two million, eight hundred thousand, four hundred twenty-one".