1209985 has 16 divisors (see below), whose sum is σ = 1677312. Its totient is φ = 820800.

The previous prime is 1209979. The next prime is 1210003. The reversal of 1209985 is 5899021.

It is not a de Polignac number, because 1209985 - 2¹³ = 1201793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1209985.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6240 + ... + 6430.

It is an arithmetic number, because the mean of its divisors is an integer number (104832).

2^1209985 is an apocalyptic number.

It is an amenable number.

1209985 is a deficient number, since it is larger than the sum of its proper divisors (467327).

1209985 is a wasteful number, since it uses less digits than its factorization.

1209985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 1209985 is about 1099.9931817971. The cubic root of 1209985 is about 106.5597833433.

The spelling of 1209985 in words is "one million, two hundred nine thousand, nine hundred eighty-five".