12549220 has 24 divisors (see below), whose sum is σ = 26430264. Its totient is φ = 5005056.

The previous prime is 12549217. The next prime is 12549223. The reversal of 12549220 is 2294521.

It is an interprime number because it is at equal distance from previous prime (12549217) and next prime (12549223).

It can be written as a sum of positive squares in 4 ways, for example, as 7268416 + 5280804 = 2696^2 + 2298^2 .

It is not an unprimeable number, because it can be changed into a prime (12549223) 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, 8454 + ... + 9826.

It is an arithmetic number, because the mean of its divisors is an integer number (1101261).

Almost surely, 2^12549220 is an apocalyptic number.

12549220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12549220 is an abundant number, since it is smaller than the sum of its proper divisors (13881044).

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

12549220 is a wasteful number, since it uses less digits than its factorization.

12549220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839 (or 1837 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 12549220 is about 3542.4878263729. The cubic root of 12549220 is about 232.3836547427.

It can be divided in two parts, 12549 and 220, that added together give a square (12769 = 113²).

The spelling of 12549220 in words is "twelve million, five hundred forty-nine thousand, two hundred twenty".