12690081 has 32 divisors (see below), whose sum is σ = 20496000. Its totient is φ = 7729344.

The previous prime is 12690077. The next prime is 12690103. The reversal of 12690081 is 18009621.

It is not a de Polignac number, because 12690081 - 2² = 12690077 is a prime.

It is a super-2 number, since 2×12690081² = 322076311573122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12690011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14451 + ... + 15303.

It is an arithmetic number, because the mean of its divisors is an integer number (640500).

Almost surely, 2^12690081 is an apocalyptic number.

It is an amenable number.

12690081 is a deficient number, since it is larger than the sum of its proper divisors (7805919).

12690081 is a wasteful number, since it uses less digits than its factorization.

12690081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910 (or 904 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 12690081 is about 3562.3139951442. The cubic root of 12690081 is about 233.2498991945.

The spelling of 12690081 in words is "twelve million, six hundred ninety thousand, eighty-one".