2278786 has 4 divisors (see below), whose sum is σ = 3418182. Its totient is φ = 1139392.

The previous prime is 2278769. The next prime is 2278807. The reversal of 2278786 is 6878722.

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

It can be written as a sum of positive squares in only one way, i.e., 2013561 + 265225 = 1419^2 + 515^2 .

It is a d-powerful number, because it can be written as 2 + 2²¹ + 7⁵ + 8 + 7⁶ + 8³ + 6⁶ .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569695 + ... + 569698.

2^2278786 is an apocalyptic number.

2278786 is a deficient number, since it is larger than the sum of its proper divisors (1139396).

2278786 is a wasteful number, since it uses less digits than its factorization.

2278786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139395.

The product of its digits is 75264, while the sum is 40.

The square root of 2278786 is about 1509.5648379583. The cubic root of 2278786 is about 131.5935230843.

The spelling of 2278786 in words is "two million, two hundred seventy-eight thousand, seven hundred eighty-six".