12986578 has 16 divisors (see below), whose sum is σ = 21306240. Its totient is φ = 5887600.

The previous prime is 12986563. The next prime is 12986579. The reversal of 12986578 is 87568921.

It is not an unprimeable number, because it can be changed into a prime (12986579) 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, 15408 + ... + 16228.

It is an arithmetic number, because the mean of its divisors is an integer number (1331640).

Almost surely, 2^12986578 is an apocalyptic number.

12986578 is a deficient number, since it is larger than the sum of its proper divisors (8319662).

12986578 is a wasteful number, since it uses less digits than its factorization.

12986578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553.

The product of its digits is 241920, while the sum is 46.

The square root of 12986578 is about 3603.6894982781. The cubic root of 12986578 is about 235.0525188188.

The spelling of 12986578 in words is "twelve million, nine hundred eighty-six thousand, five hundred seventy-eight".