12885840 has 120 divisors (see below), whose sum is σ = 47238048. Its totient is φ = 3121920.

The previous prime is 12885827. The next prime is 12885841. The reversal of 12885840 is 4858821.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 12885795 and 12885804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12885841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7107 + ... + 8733.

Almost surely, 2^12885840 is an apocalyptic number.

12885840 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 12885840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23619024).

12885840 is an abundant number, since it is smaller than the sum of its proper divisors (34352208).

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

12885840 is a wasteful number, since it uses less digits than its factorization.

12885840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657 (or 1648 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 12885840 is about 3589.6852229687. The cubic root of 12885840 is about 234.4431663057.

The spelling of 12885840 in words is "twelve million, eight hundred eighty-five thousand, eight hundred forty".