12155399 has 4 divisors (see below), whose sum is σ = 12230136. Its totient is φ = 12080664.

The previous prime is 12155389. The next prime is 12155401. The reversal of 12155399 is 99355121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99355121 = 6829 ⋅14549.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12155399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155389) 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, 37124 + ... + 37449.

It is an arithmetic number, because the mean of its divisors is an integer number (3057534).

Almost surely, 2^12155399 is an apocalyptic number.

12155399 is a deficient number, since it is larger than the sum of its proper divisors (74737).

12155399 is an equidigital number, since it uses as much as digits as its factorization.

12155399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74736.

The product of its digits is 12150, while the sum is 35.

The square root of 12155399 is about 3486.4593787968. The cubic root of 12155399 is about 229.9268765654.

The spelling of 12155399 in words is "twelve million, one hundred fifty-five thousand, three hundred ninety-nine".