2784139 has 8 divisors (see below), whose sum is σ = 2922048. Its totient is φ = 2649600.

The previous prime is 2784137. The next prime is 2784149. The reversal of 2784139 is 9314872.

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 2784139 - 2¹ = 2784137 is a prime.

It is a Duffinian number.

2784139 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2784137) 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 7 ways as a sum of consecutive naturals, for example, 939 + ... + 2539.

It is an arithmetic number, because the mean of its divisors is an integer number (365256).

2^2784139 is an apocalyptic number.

2784139 is a deficient number, since it is larger than the sum of its proper divisors (137909).

2784139 is a wasteful number, since it uses less digits than its factorization.

2784139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685.

The product of its digits is 12096, while the sum is 34.

The square root of 2784139 is about 1668.5739420235. The cubic root of 2784139 is about 140.6793343288.

The spelling of 2784139 in words is "two million, seven hundred eighty-four thousand, one hundred thirty-nine".