12155538 has 8 divisors (see below), whose sum is σ = 24311088. Its totient is φ = 4051844.

The previous prime is 12155537. The next prime is 12155567. The reversal of 12155538 is 83555121.

It is a sphenic number, since it is the product of 3 distinct primes.

12155538 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (12155537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1012956 + ... + 1012967.

It is an arithmetic number, because the mean of its divisors is an integer number (3038886).

Almost surely, 2^12155538 is an apocalyptic number.

12155538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12155538 is a wasteful number, since it uses less digits than its factorization.

12155538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2025928.

The product of its digits is 6000, while the sum is 30.

The square root of 12155538 is about 3486.4793130033. The cubic root of 12155538 is about 229.9277529857.

The spelling of 12155538 in words is "twelve million, one hundred fifty-five thousand, five hundred thirty-eight".