12991834 has 16 divisors (see below), whose sum is σ = 20393856. Its totient is φ = 6200800.

The previous prime is 12991813. The next prime is 12991871. The reversal of 12991834 is 43819921.

It is a junction number, because it is equal to n+sod(n) for n = 12991793 and 12991802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2169 + ... + 5539.

It is an arithmetic number, because the mean of its divisors is an integer number (1274616).

Almost surely, 2^12991834 is an apocalyptic number.

12991834 is the 1927-th nonagonal number.

12991834 is a deficient number, since it is larger than the sum of its proper divisors (7402022).

12991834 is a wasteful number, since it uses less digits than its factorization.

12991834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3461.

The product of its digits is 15552, while the sum is 37.

The square root of 12991834 is about 3604.4186771240. The cubic root of 12991834 is about 235.0842251289.

The spelling of 12991834 in words is "twelve million, nine hundred ninety-one thousand, eight hundred thirty-four".