12181956 has 12 divisors (see below), whose sum is σ = 28424592. Its totient is φ = 4060648.

The previous prime is 12181951. The next prime is 12181957. The reversal of 12181956 is 65918121.

12181956 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (12181951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507570 + ... + 507593.

It is an arithmetic number, because the mean of its divisors is an integer number (2368716).

Almost surely, 2^12181956 is an apocalyptic number.

It is an amenable number.

12181956 is an abundant number, since it is smaller than the sum of its proper divisors (16242636).

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

12181956 is a wasteful number, since it uses less digits than its factorization.

12181956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015170 (or 1015168 counting only the distinct ones).

The product of its digits is 4320, while the sum is 33.

The square root of 12181956 is about 3490.2658924500. The cubic root of 12181956 is about 230.0942021177.

The spelling of 12181956 in words is "twelve million, one hundred eighty-one thousand, nine hundred fifty-six".