12981999 has 16 divisors (see below), whose sum is σ = 18400608. Its totient is φ = 8113152.

The previous prime is 12981977. The next prime is 12982003. The reversal of 12981999 is 99918921.

It is not a de Polignac number, because 12981999 - 2⁵ = 12981967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12981949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23029 + ... + 23585.

It is an arithmetic number, because the mean of its divisors is an integer number (1150038).

Almost surely, 2^12981999 is an apocalyptic number.

12981999 is a deficient number, since it is larger than the sum of its proper divisors (5418609).

12981999 is a wasteful number, since it uses less digits than its factorization.

12981999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034.

The product of its digits is 104976, while the sum is 48.

The square root of 12981999 is about 3603.0541211589. The cubic root of 12981999 is about 235.0248894718.

It can be divided in two parts, 129 and 81999, that added together give a palindrome (82128).

The spelling of 12981999 in words is "twelve million, nine hundred eighty-one thousand, nine hundred ninety-nine".