12999985 has 8 divisors (see below), whose sum is σ = 16517736. Its totient is φ = 9788160.

The previous prime is 12999983. The next prime is 12999989. The reversal of 12999985 is 58999921.

12999985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6533136 + 6466849 = 2556^2 + 2543^2 .

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

It is not a de Polignac number, because 12999985 - 2¹ = 12999983 is a prime.

It is a super-2 number, since 2×12999985² = 337999220000450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12999983) 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, 76386 + ... + 76555.

It is an arithmetic number, because the mean of its divisors is an integer number (2064717).

Almost surely, 2^12999985 is an apocalyptic number.

It is an amenable number.

12999985 is a deficient number, since it is larger than the sum of its proper divisors (3517751).

12999985 is a wasteful number, since it uses less digits than its factorization.

12999985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152963.

The product of its digits is 524880, while the sum is 52.

The square root of 12999985 is about 3605.5491953377. The cubic root of 12999985 is about 235.1333783361.

The spelling of 12999985 in words is "twelve million, nine hundred ninety-nine thousand, nine hundred eighty-five".