2278458 has 72 divisors (see below), whose sum is σ = 6166368. Its totient is φ = 595296.

The previous prime is 2278453. The next prime is 2278477. The reversal of 2278458 is 8548722.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2278453) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21241 + ... + 21347.

It is an arithmetic number, because the mean of its divisors is an integer number (85644).

2^2278458 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2278458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3083184).

2278458 is an abundant number, since it is smaller than the sum of its proper divisors (3887910).

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

2278458 is a wasteful number, since it uses less digits than its factorization.

2278458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 132 counting only the distinct ones).

The product of its digits is 35840, while the sum is 36.

The square root of 2278458 is about 1509.4561934684. The cubic root of 2278458 is about 131.5872090869.

The spelling of 2278458 in words is "two million, two hundred seventy-eight thousand, four hundred fifty-eight".