12172143 has 4 divisors (see below), whose sum is σ = 16229528. Its totient is φ = 8114760.

The previous prime is 12172133. The next prime is 12172151. The reversal of 12172143 is 34127121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12172143 - 2⁶ = 12172079 is a prime.

It is a super-2 number, since 2×12172143² = 296322130424898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12172133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2028688 + ... + 2028693.

It is an arithmetic number, because the mean of its divisors is an integer number (4057382).

Almost surely, 2^12172143 is an apocalyptic number.

12172143 is a deficient number, since it is larger than the sum of its proper divisors (4057385).

12172143 is an equidigital number, since it uses as much as digits as its factorization.

12172143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4057384.

The product of its digits is 336, while the sum is 21.

The square root of 12172143 is about 3488.8598424127. The cubic root of 12172143 is about 230.0324024923.

Adding to 12172143 its reverse (34127121), we get a palindrome (46299264).

The spelling of 12172143 in words is "twelve million, one hundred seventy-two thousand, one hundred forty-three".