12161730 has 64 divisors (see below), whose sum is σ = 34525440. Its totient is φ = 2682624.

The previous prime is 12161719. The next prime is 12161771. The reversal of 12161730 is 3716121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 12161697 and 12161706.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5092 + ... + 7088.

It is an arithmetic number, because the mean of its divisors is an integer number (539460).

Almost surely, 2^12161730 is an apocalyptic number.

12161730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12161730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17262720).

12161730 is an abundant number, since it is smaller than the sum of its proper divisors (22363710).

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

12161730 is a wasteful number, since it uses less digits than its factorization.

12161730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 12161730 is about 3487.3672017727. The cubic root of 12161730 is about 229.9667878950.

Adding to 12161730 its reverse (3716121), we get a palindrome (15877851).

The spelling of 12161730 in words is "twelve million, one hundred sixty-one thousand, seven hundred thirty".