12999040 has 64 divisors (see below), whose sum is σ = 32742000. Its totient is φ = 4921344.

The previous prime is 12998987. The next prime is 12999043. The reversal of 12999040 is 4099921.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 12998987 and 12999005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12999043) 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, 11626 + ... + 12694.

Almost surely, 2^12999040 is an apocalyptic number.

12999040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12999040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16371000).

12999040 is an abundant number, since it is smaller than the sum of its proper divisors (19742960).

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

12999040 is a wasteful number, since it uses less digits than its factorization.

12999040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107 (or 1095 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 12999040 is about 3605.4181449591. The cubic root of 12999040 is about 235.1276807288.

The spelling of 12999040 in words is "twelve million, nine hundred ninety-nine thousand, forty".