2278840 has 32 divisors (see below), whose sum is σ = 5352480. Its totient is φ = 871552.

The previous prime is 2278831. The next prime is 2278847. The reversal of 2278840 is 488722.

It is a super-2 number, since 2×2278840² = 10386223491200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2278847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319 + ... + 2158.

It is an arithmetic number, because the mean of its divisors is an integer number (167265).

2^2278840 is an apocalyptic number.

2278840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2278840 is an abundant number, since it is smaller than the sum of its proper divisors (3073640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2278840 is a wasteful number, since it uses less digits than its factorization.

2278840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511 (or 2507 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 2278840 is about 1509.5827238015. The cubic root of 2278840 is about 131.5945625257.

The spelling of 2278840 in words is "two million, two hundred seventy-eight thousand, eight hundred forty".