2199949 has 4 divisors (see below), whose sum is σ = 2208060. Its totient is φ = 2191840.

The previous prime is 2199941. The next prime is 2199959. The reversal of 2199949 is 9499912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 842724 + 1357225 = 918^2 + 1165^2 .

It is a cyclic number.

It is not a de Polignac number, because 2199949 - 2³ = 2199941 is a prime.

It is a Duffinian number.

2199949 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2199941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3634 + ... + 4195.

It is an arithmetic number, because the mean of its divisors is an integer number (552015).

2^2199949 is an apocalyptic number.

It is an amenable number.

2199949 is a deficient number, since it is larger than the sum of its proper divisors (8111).

2199949 is an equidigital number, since it uses as much as digits as its factorization.

2199949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8110.

The product of its digits is 52488, while the sum is 43.

The square root of 2199949 is about 1483.2225052230. Note that the first 3 decimals coincide. The cubic root of 2199949 is about 130.0581396749.

The spelling of 2199949 in words is "two million, one hundred ninety-nine thousand, nine hundred forty-nine".