12290155 has 4 divisors (see below), whose sum is σ = 14748192. Its totient is φ = 9832120.

The previous prime is 12290153. The next prime is 12290177. The reversal of 12290155 is 55109221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55109221 = 683 ⋅80687.

It is not a de Polignac number, because 12290155 - 2¹ = 12290153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12290153) 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, 1229011 + ... + 1229020.

It is an arithmetic number, because the mean of its divisors is an integer number (3687048).

Almost surely, 2^12290155 is an apocalyptic number.

12290155 is a deficient number, since it is larger than the sum of its proper divisors (2458037).

12290155 is an equidigital number, since it uses as much as digits as its factorization.

12290155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2458036.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 12290155 is about 3505.7317353158. The cubic root of 12290155 is about 230.7734202516.

Adding to 12290155 its reverse (55109221), we get a palindrome (67399376).

The spelling of 12290155 in words is "twelve million, two hundred ninety thousand, one hundred fifty-five".