2278393 has 4 divisors (see below), whose sum is σ = 2453668. Its totient is φ = 2103120.

The previous prime is 2278379. The next prime is 2278421. The reversal of 2278393 is 3938722.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1006009 + 1272384 = 1003^2 + 1128^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278393 - 2⁵ = 2278361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2278303) 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, 87618 + ... + 87643.

It is an arithmetic number, because the mean of its divisors is an integer number (613417).

2^2278393 is an apocalyptic number.

It is an amenable number.

2278393 is a deficient number, since it is larger than the sum of its proper divisors (175275).

2278393 is a wasteful number, since it uses less digits than its factorization.

2278393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175274.

The product of its digits is 18144, while the sum is 34.

The square root of 2278393 is about 1509.4346623819. The cubic root of 2278393 is about 131.5859577654.

The spelling of 2278393 in words is "two million, two hundred seventy-eight thousand, three hundred ninety-three".