2783421 has 6 divisors (see below), whose sum is σ = 4020510. Its totient is φ = 1855608.

The previous prime is 2783419. The next prime is 2783423. The reversal of 2783421 is 1243872.

It is an interprime number because it is at equal distance from previous prime (2783419) and next prime (2783423).

It can be written as a sum of positive squares in only one way, i.e., 2160900 + 622521 = 1470^2 + 789^2 .

It is not a de Polignac number, because 2783421 - 2¹ = 2783419 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2783423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 154626 + ... + 154643.

It is an arithmetic number, because the mean of its divisors is an integer number (670085).

2^2783421 is an apocalyptic number.

It is an amenable number.

2783421 is a deficient number, since it is larger than the sum of its proper divisors (1237089).

2783421 is a wasteful number, since it uses less digits than its factorization.

2783421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309275 (or 309272 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 2783421 is about 1668.3587743648. The cubic root of 2783421 is about 140.6672400517.

The spelling of 2783421 in words is "two million, seven hundred eighty-three thousand, four hundred twenty-one".