12718220 has 24 divisors (see below), whose sum is σ = 28114800. Its totient is φ = 4819392.

The previous prime is 12718213. The next prime is 12718249. The reversal of 12718220 is 2281721.

It is a super-3 number, since 3×12718220³ (a number of 22 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16355 + ... + 17114.

It is an arithmetic number, because the mean of its divisors is an integer number (1171450).

Almost surely, 2^12718220 is an apocalyptic number.

12718220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12718220 is an abundant number, since it is smaller than the sum of its proper divisors (15396580).

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

12718220 is a wasteful number, since it uses less digits than its factorization.

12718220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33497 (or 33495 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 12718220 is about 3566.2613476861. The cubic root of 12718220 is about 233.4221747862.

Adding to 12718220 its reverse (2281721), we get a palindrome (14999941).

It can be divided in two parts, 127182 and 20, that multiplied together give a triangular number (2543640 = T₂₂₅₅).

The spelling of 12718220 in words is "twelve million, seven hundred eighteen thousand, two hundred twenty".