12156005 has 4 divisors (see below), whose sum is σ = 14587212. Its totient is φ = 9724800.

The previous prime is 12155993. The next prime is 12156013. The reversal of 12156005 is 50065121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50065121 = 5471 ⋅9151.

It can be written as a sum of positive squares in 2 ways, for example, as 8655364 + 3500641 = 2942^2 + 1871^2 .

It is not a de Polignac number, because 12156005 - 2⁴ = 12155989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1215596 + ... + 1215605.

It is an arithmetic number, because the mean of its divisors is an integer number (3646803).

Almost surely, 2^12156005 is an apocalyptic number.

It is an amenable number.

12156005 is a deficient number, since it is larger than the sum of its proper divisors (2431207).

12156005 is an equidigital number, since it uses as much as digits as its factorization.

12156005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431206.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 12156005 is about 3486.5462853661. The cubic root of 12156005 is about 229.9306974567.

The spelling of 12156005 in words is "twelve million, one hundred fifty-six thousand, five".