1209985329 has 8 divisors (see below), whose sum is σ = 1843787200. Its totient is φ = 691420176.

The previous prime is 1209985327. The next prime is 1209985331. The reversal of 1209985329 is 9235899021.

It is an interprime number because it is at equal distance from previous prime (1209985327) and next prime (1209985331).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1209985329 - 2¹ = 1209985327 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209985321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28809154 + ... + 28809195.

It is an arithmetic number, because the mean of its divisors is an integer number (230473400).

Almost surely, 2^1209985329 is an apocalyptic number.

It is an amenable number.

1209985329 is a deficient number, since it is larger than the sum of its proper divisors (633801871).

1209985329 is an equidigital number, since it uses as much as digits as its factorization.

1209985329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57618359.

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 1209985329 is about 34784.8433804150. The cubic root of 1209985329 is about 1065.5979300136.

The spelling of 1209985329 in words is "one billion, two hundred nine million, nine hundred eighty-five thousand, three hundred twenty-nine".