12133530 has 32 divisors (see below), whose sum is σ = 32356800. Its totient is φ = 3235536.

The previous prime is 12133523. The next prime is 12133543. The reversal of 12133530 is 3533121.

12133530 is a `hidden beast` number, since 1 + 2 + 133 + 530 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 15 ways as a sum of consecutive naturals, for example, 22200 + ... + 22739.

It is an arithmetic number, because the mean of its divisors is an integer number (1011150).

Almost surely, 2^12133530 is an apocalyptic number.

12133530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12133530 is an abundant number, since it is smaller than the sum of its proper divisors (20223270).

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

12133530 is a wasteful number, since it uses less digits than its factorization.

12133530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44955 (or 44949 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 12133530 is about 3483.3216905707. The cubic root of 12133530 is about 229.7889052446.

Adding to 12133530 its reverse (3533121), we get a palindrome (15666651).

The spelling of 12133530 in words is "twelve million, one hundred thirty-three thousand, five hundred thirty".