12261720 has 32 divisors (see below), whose sum is σ = 36785520. Its totient is φ = 3269760.

The previous prime is 12261713. The next prime is 12261791. The reversal of 12261720 is 2716221.

12261720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50971 + ... + 51210.

Almost surely, 2^12261720 is an apocalyptic number.

12261720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12261720 is an abundant number, since it is smaller than the sum of its proper divisors (24523800).

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

12261720 is a wasteful number, since it uses less digits than its factorization.

12261720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102195 (or 102191 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 12261720 is about 3501.6738854439. The cubic root of 12261720 is about 230.5953072428.

Adding to 12261720 its reverse (2716221), we get a palindrome (14977941).

The spelling of 12261720 in words is "twelve million, two hundred sixty-one thousand, seven hundred twenty".