2199969 has 12 divisors (see below), whose sum is σ = 3287700. Its totient is φ = 1415904.

The previous prime is 2199961. The next prime is 2199971. The reversal of 2199969 is 9699912.

Added to its reverse (9699912) it gives a triangular number (11899881 = T₄₈₇₈).

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 731025 + 1468944 = 855^2 + 1212^2 .

It is not a de Polignac number, because 2199969 - 2³ = 2199961 is a prime.

It is a super-2 number, since 2×2199969² = 9679727201922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2199961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3954 + ... + 4475.

It is an arithmetic number, because the mean of its divisors is an integer number (273975).

2^2199969 is an apocalyptic number.

2199969 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2199969 is a deficient number, since it is larger than the sum of its proper divisors (1087731).

2199969 is a wasteful number, since it uses less digits than its factorization.

2199969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8464 (or 8461 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 2199969 is about 1483.2292472845. The cubic root of 2199969 is about 130.0585337984.

Adding to 2199969 its reverse (9699912), we get a triangular number (11899881 = T₄₈₇₈).

The spelling of 2199969 in words is "two million, one hundred ninety-nine thousand, nine hundred sixty-nine".