12071538 has 16 divisors (see below), whose sum is σ = 26825760. Its totient is φ = 4023828.

The previous prime is 12071537. The next prime is 12071557. The reversal of 12071538 is 83517021.

12071538 is a `hidden beast` number, since 120 + 7 + 1 + 538 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12071531) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 111720 + ... + 111827.

It is an arithmetic number, because the mean of its divisors is an integer number (1676610).

Almost surely, 2^12071538 is an apocalyptic number.

12071538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12071538 is an abundant number, since it is smaller than the sum of its proper divisors (14754222).

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

12071538 is a wasteful number, since it uses less digits than its factorization.

12071538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223558 (or 223552 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 12071538 is about 3474.4118926805. The cubic root of 12071538 is about 229.3968950334.

Adding to 12071538 its reverse (83517021), we get a palindrome (95588559).

The spelling of 12071538 in words is "twelve million, seventy-one thousand, five hundred thirty-eight".