12999540 has 96 divisors (see below), whose sum is σ = 39029760. Its totient is φ = 3225600.

The previous prime is 12999533. The next prime is 12999557. The reversal of 12999540 is 4599921.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 53820 + ... + 54060.

It is an arithmetic number, because the mean of its divisors is an integer number (406560).

Almost surely, 2^12999540 is an apocalyptic number.

12999540 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 12999540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19514880).

12999540 is an abundant number, since it is smaller than the sum of its proper divisors (26030220).

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

12999540 is a wasteful number, since it uses less digits than its factorization.

12999540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 12999540 is about 3605.4874843771. The cubic root of 12999540 is about 235.1306953702.

The spelling of 12999540 in words is "twelve million, nine hundred ninety-nine thousand, five hundred forty".