312189 has 8 divisors (see below), whose sum is σ = 438240. Its totient is φ = 197136.

The previous prime is 312161. The next prime is 312197. The reversal of 312189 is 981213.

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

It is not a de Polignac number, because 312189 - 2⁹ = 311677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2682 + ... + 2795.

It is an arithmetic number, because the mean of its divisors is an integer number (54780).

2³¹²¹⁸⁹ is an apocalyptic number.

It is an amenable number.

312189 is a deficient number, since it is larger than the sum of its proper divisors (126051).

312189 is a wasteful number, since it uses less digits than its factorization.

312189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5499.

The product of its digits is 432, while the sum is 24.

The square root of 312189 is about 558.7387582762. The cubic root of 312189 is about 67.8379213728.

Adding to 312189 its sum of digits (24), we get a palindrome (312213).

The spelling of 312189 in words is "three hundred twelve thousand, one hundred eighty-nine".