2784391 has 4 divisors (see below), whose sum is σ = 2801232. Its totient is φ = 2767552.

The previous prime is 2784373. The next prime is 2784473. The reversal of 2784391 is 1934872.

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

It is a cyclic number.

It is not a de Polignac number, because 2784391 - 2⁵ = 2784359 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 (2784371) 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, 8170 + ... + 8503.

It is an arithmetic number, because the mean of its divisors is an integer number (700308).

2^2784391 is an apocalyptic number.

2784391 is a deficient number, since it is larger than the sum of its proper divisors (16841).

2784391 is a wasteful number, since it uses less digits than its factorization.

2784391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16840.

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

The square root of 2784391 is about 1668.6494538998. The cubic root of 2784391 is about 140.6835786240.

The spelling of 2784391 in words is "two million, seven hundred eighty-four thousand, three hundred ninety-one".