2278389 has 4 divisors (see below), whose sum is σ = 3037856. Its totient is φ = 1518924.

The previous prime is 2278379. The next prime is 2278421. The reversal of 2278389 is 9838722.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2278389 - 2⁷ = 2278261 is a prime.

It is a d-powerful number, because it can be written as 2¹³ + 2¹⁷ + 7⁴ + 8⁵ + 3⁵ + 8⁷ + 9⁴ .

It is a D-number.

It is a Duffinian number.

It is a Curzon 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, 379729 + ... + 379734.

It is an arithmetic number, because the mean of its divisors is an integer number (759464).

2^2278389 is an apocalyptic number.

It is an amenable number.

2278389 is a deficient number, since it is larger than the sum of its proper divisors (759467).

2278389 is an equidigital number, since it uses as much as digits as its factorization.

2278389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759466.

The product of its digits is 48384, while the sum is 39.

The square root of 2278389 is about 1509.4333373819. The cubic root of 2278389 is about 131.5858807603.

The spelling of 2278389 in words is "two million, two hundred seventy-eight thousand, three hundred eighty-nine".