12072155 has 8 divisors (see below), whose sum is σ = 14563584. Its totient is φ = 9606400.

The previous prime is 12072139. The next prime is 12072169. The reversal of 12072155 is 55127021.

It is a happy number.

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

It is not a de Polignac number, because 12072155 - 2⁴ = 12072139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12072155.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5366 + ... + 7275.

It is an arithmetic number, because the mean of its divisors is an integer number (1820448).

Almost surely, 2^12072155 is an apocalyptic number.

12072155 is a deficient number, since it is larger than the sum of its proper divisors (2491429).

12072155 is a wasteful number, since it uses less digits than its factorization.

12072155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12837.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 12072155 is about 3474.5006835515. The cubic root of 12072155 is about 229.4008032754.

Adding to 12072155 its reverse (55127021), we get a palindrome (67199176).

It can be divided in two parts, 1207215 and 5, that multiplied together give a triangular number (6036075 = T₃₄₇₄).

The spelling of 12072155 in words is "twelve million, seventy-two thousand, one hundred fifty-five".