2219749 has 12 divisors (see below), whose sum is σ = 2616300. Its totient is φ = 1877568.

The previous prime is 2219731. The next prime is 2219771. The reversal of 2219749 is 9479122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1117249 + 1102500 = 1057^2 + 1050^2 .

It is not a de Polignac number, because 2219749 - 2⁷ = 2219621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2219449) 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 11 ways as a sum of consecutive naturals, for example, 4107 + ... + 4615.

It is an arithmetic number, because the mean of its divisors is an integer number (218025).

2^2219749 is an apocalyptic number.

It is an amenable number.

2219749 is a deficient number, since it is larger than the sum of its proper divisors (396551).

2219749 is an equidigital number, since it uses as much as digits as its factorization.

2219749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612 (or 605 counting only the distinct ones).

The product of its digits is 9072, while the sum is 34.

The square root of 2219749 is about 1489.8822101092. The cubic root of 2219749 is about 130.4471583797.

The spelling of 2219749 in words is "two million, two hundred nineteen thousand, seven hundred forty-nine".