12985578 has 24 divisors (see below), whose sum is σ = 28202148. Its totient is φ = 4318272.

The previous prime is 12985549. The next prime is 12985597. The reversal of 12985578 is 87558921.

It is a happy number.

12985578 is a `hidden beast` number, since 1 + 2 + 98 + 557 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12981609 + 3969 = 3603^2 + 63^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 13150 + ... + 14102.

Almost surely, 2^12985578 is an apocalyptic number.

12985578 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12985578 is an abundant number, since it is smaller than the sum of its proper divisors (15216570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12985578 is a wasteful number, since it uses less digits than its factorization.

12985578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718 (or 1715 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 12985578 is about 3603.5507489142. The cubic root of 12985578 is about 235.0464854472.

The spelling of 12985578 in words is "twelve million, nine hundred eighty-five thousand, five hundred seventy-eight".