2278387 has 4 divisors (see below), whose sum is σ = 2288160. Its totient is φ = 2268616.

The previous prime is 2278379. The next prime is 2278421. The reversal of 2278387 is 7838722.

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 2278387 - 2³ = 2278379 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2¹⁷ + 2²¹ + 7² + 8³ + 3³ + 8⁵ + 7⁵ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2278307) 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, 4528 + ... + 5005.

It is an arithmetic number, because the mean of its divisors is an integer number (572040).

2^2278387 is an apocalyptic number.

2278387 is a deficient number, since it is larger than the sum of its proper divisors (9773).

2278387 is an equidigital number, since it uses as much as digits as its factorization.

2278387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9772.

The product of its digits is 37632, while the sum is 37.

The square root of 2278387 is about 1509.4326748815. The cubic root of 2278387 is about 131.5858422576.

The spelling of 2278387 in words is "two million, two hundred seventy-eight thousand, three hundred eighty-seven".