2278991 has 8 divisors (see below), whose sum is σ = 2677584. Its totient is φ = 1912320.

The previous prime is 2278981. The next prime is 2279009. The reversal of 2278991 is 1998722.

2278991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2278991 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2278961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7826 + ... + 8111.

It is an arithmetic number, because the mean of its divisors is an integer number (334698).

2^2278991 is an apocalyptic number.

2278991 is a deficient number, since it is larger than the sum of its proper divisors (398593).

2278991 is a wasteful number, since it uses less digits than its factorization.

2278991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15961.

The product of its digits is 18144, while the sum is 38.

The square root of 2278991 is about 1509.6327367940. The cubic root of 2278991 is about 131.5974690250.

The spelling of 2278991 in words is "two million, two hundred seventy-eight thousand, nine hundred ninety-one".