2278399 has 4 divisors (see below), whose sum is σ = 2288664. Its totient is φ = 2268136.

The previous prime is 2278379. The next prime is 2278421. The reversal of 2278399 is 9938722.

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 2278399 - 2¹⁵ = 2245631 is a prime.

It is a super-2 number, since 2×2278399² = 10382204006402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2278379) 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, 4792 + ... + 5245.

It is an arithmetic number, because the mean of its divisors is an integer number (572166).

2^2278399 is an apocalyptic number.

2278399 is a deficient number, since it is larger than the sum of its proper divisors (10265).

2278399 is a wasteful number, since it uses less digits than its factorization.

2278399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10264.

The product of its digits is 54432, while the sum is 40.

The square root of 2278399 is about 1509.4366498797. The cubic root of 2278399 is about 131.5860732730.

The spelling of 2278399 in words is "two million, two hundred seventy-eight thousand, three hundred ninety-nine".