12091985 has 16 divisors (see below), whose sum is σ = 15195600. Its totient is φ = 9225216.

The previous prime is 12091979. The next prime is 12092033. The reversal of 12091985 is 58919021.

12091985 = T₂₇₆ + T₂₇₇ + ... + T₄₅₃.

It can be written as a sum of positive squares in 8 ways, for example, as 2795584 + 9296401 = 1672^2 + 3049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12091985 is a prime.

It is a super-2 number, since 2×12091985² = 292432202480450, which contains 22 as substring.

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, 12437 + ... + 13373.

It is an arithmetic number, because the mean of its divisors is an integer number (949725).

Almost surely, 2^12091985 is an apocalyptic number.

It is an amenable number.

12091985 is a deficient number, since it is larger than the sum of its proper divisors (3103615).

12091985 is an equidigital number, since it uses as much as digits as its factorization.

12091985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 12091985 is about 3477.3531600917. The cubic root of 12091985 is about 229.5263409121.

The spelling of 12091985 in words is "twelve million, ninety-one thousand, nine hundred eighty-five".