2143278 has 48 divisors (see below), whose sum is σ = 5031936. Its totient is φ = 657360.

The previous prime is 2143261. The next prime is 2143279. The reversal of 2143278 is 8723412.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143279) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12751 + ... + 12917.

It is an arithmetic number, because the mean of its divisors is an integer number (104832).

2^2143278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2143278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2515968).

2143278 is an abundant number, since it is smaller than the sum of its proper divisors (2888658).

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

2143278 is a wasteful number, since it uses less digits than its factorization.

2143278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 226 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 2143278 is about 1463.9938524461. The cubic root of 2143278 is about 128.9316385585.

The spelling of 2143278 in words is "two million, one hundred forty-three thousand, two hundred seventy-eight".