2199729 has 24 divisors (see below), whose sum is σ = 3495360. Its totient is φ = 1205280.

The previous prime is 2199719. The next prime is 2199739. The reversal of 2199729 is 9279912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2199719) and next prime (2199739).

It is not a de Polignac number, because 2199729 - 2⁷ = 2199601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2199719) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20127 + ... + 20235.

It is an arithmetic number, because the mean of its divisors is an integer number (145640).

2^2199729 is an apocalyptic number.

It is an amenable number.

2199729 is a deficient number, since it is larger than the sum of its proper divisors (1295631).

2199729 is a wasteful number, since it uses less digits than its factorization.

2199729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 150 counting only the distinct ones).

The product of its digits is 20412, while the sum is 39.

The square root of 2199729 is about 1483.1483405243. The cubic root of 2199729 is about 130.0538041585.

The spelling of 2199729 in words is "two million, one hundred ninety-nine thousand, seven hundred twenty-nine".