1209899 has 6 divisors (see below), whose sum is σ = 1251180. Its totient is φ = 1169940.

The previous prime is 1209889. The next prime is 1209931. The reversal of 1209899 is 9989021.

It is not a de Polignac number, because 1209899 - 2⁴ = 1209883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 332 + ... + 1590.

It is an arithmetic number, because the mean of its divisors is an integer number (208530).

2^1209899 is an apocalyptic number.

1209899 is a deficient number, since it is larger than the sum of its proper divisors (41281).

1209899 is an equidigital number, since it uses as much as digits as its factorization.

1209899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321 (or 1290 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 1209899 is about 1099.9540899510. The cubic root of 1209899 is about 106.5572586954.

The spelling of 1209899 in words is "one million, two hundred nine thousand, eight hundred ninety-nine".