12161985 has 16 divisors (see below), whose sum is σ = 21228480. Its totient is φ = 5896640.

The previous prime is 12161977. The next prime is 12161999. The reversal of 12161985 is 58916121.

12161985 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 not a de Polignac number, because 12161985 - 2³ = 12161977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36690 + ... + 37019.

It is an arithmetic number, because the mean of its divisors is an integer number (1326780).

Almost surely, 2^12161985 is an apocalyptic number.

12161985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12161985 is a deficient number, since it is larger than the sum of its proper divisors (9066495).

12161985 is a wasteful number, since it uses less digits than its factorization.

12161985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73728.

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

The square root of 12161985 is about 3487.4037621130. The cubic root of 12161985 is about 229.9683951532.

The spelling of 12161985 in words is "twelve million, one hundred sixty-one thousand, nine hundred eighty-five".