2278391 has 8 divisors (see below), whose sum is σ = 2427264. Its totient is φ = 2131200.

The previous prime is 2278379. The next prime is 2278421. The reversal of 2278391 is 1938722.

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 2278391 - 2¹⁰ = 2277367 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 (2278301) 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, 3491 + ... + 4091.

It is an arithmetic number, because the mean of its divisors is an integer number (303408).

2^2278391 is an apocalyptic number.

2278391 is a deficient number, since it is larger than the sum of its proper divisors (148873).

2278391 is a wasteful number, since it uses less digits than its factorization.

2278391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841.

The product of its digits is 6048, while the sum is 32.

The square root of 2278391 is about 1509.4339998821. The cubic root of 2278391 is about 131.5859192629.

The spelling of 2278391 in words is "two million, two hundred seventy-eight thousand, three hundred ninety-one".