2978281 has 8 divisors (see below), whose sum is σ = 3231144. Its totient is φ = 2734080.

The previous prime is 2978273. The next prime is 2978299. The reversal of 2978281 is 1828792.

It can be written as a sum of positive squares in 4 ways, for example, as 57600 + 2920681 = 240^2 + 1709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2978281 - 2³ = 2978273 is a prime.

It is a super-2 number, since 2×2978281² = 17740315429922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 2978281.

It is not an unprimeable number, because it can be changed into a prime (2978251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1440 + ... + 2833.

It is an arithmetic number, because the mean of its divisors is an integer number (403893).

2^2978281 is an apocalyptic number.

It is an amenable number.

2978281 is a deficient number, since it is larger than the sum of its proper divisors (252863).

2978281 is a wasteful number, since it uses less digits than its factorization.

2978281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4331.

The product of its digits is 16128, while the sum is 37.

The square root of 2978281 is about 1725.7696833587. The cubic root of 2978281 is about 143.8760668504.

The spelling of 2978281 in words is "two million, nine hundred seventy-eight thousand, two hundred eighty-one".