12023155 has 4 divisors (see below), whose sum is σ = 14427792. Its totient is φ = 9618520.

The previous prime is 12023153. The next prime is 12023159. The reversal of 12023155 is 55132021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55132021 = 7 ⋅7876003.

It is not a de Polignac number, because 12023155 - 2¹ = 12023153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12023153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1202311 + ... + 1202320.

It is an arithmetic number, because the mean of its divisors is an integer number (3606948).

Almost surely, 2^12023155 is an apocalyptic number.

12023155 is a deficient number, since it is larger than the sum of its proper divisors (2404637).

12023155 is an equidigital number, since it uses as much as digits as its factorization.

12023155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404636.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 12023155 is about 3467.4421408295. The cubic root of 12023155 is about 229.0900086669.

Adding to 12023155 its reverse (55132021), we get a palindrome (67155176).

The spelling of 12023155 in words is "twelve million, twenty-three thousand, one hundred fifty-five".