2229781 has 8 divisors (see below), whose sum is σ = 2407680. Its totient is φ = 2058672.

The previous prime is 2229779. The next prime is 2229791. The reversal of 2229781 is 1879222.

2229781 is nontrivially palindromic in base 9.

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 2229781 - 2¹ = 2229779 is a prime.

It is a super-2 number, since 2×2229781² = 9943846615922, which contains 22 as substring.

It is a Duffinian number.

2229781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2229701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1005 + ... + 2338.

It is an arithmetic number, because the mean of its divisors is an integer number (300960).

2^2229781 is an apocalyptic number.

It is an amenable number.

2229781 is a deficient number, since it is larger than the sum of its proper divisors (177899).

2229781 is a wasteful number, since it uses less digits than its factorization.

2229781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3395.

The product of its digits is 4032, while the sum is 31.

The square root of 2229781 is about 1493.2451238829. The cubic root of 2229781 is about 130.6433786706.

The spelling of 2229781 in words is "two million, two hundred twenty-nine thousand, seven hundred eighty-one".