12143391 has 16 divisors (see below), whose sum is σ = 17611776. Its totient is φ = 7397856.

The previous prime is 12143387. The next prime is 12143407. The reversal of 12143391 is 19334121.

It is not a de Polignac number, because 12143391 - 2² = 12143387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12143371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2506 + ... + 5528.

It is an arithmetic number, because the mean of its divisors is an integer number (1100736).

Almost surely, 2^12143391 is an apocalyptic number.

12143391 is a deficient number, since it is larger than the sum of its proper divisors (5468385).

12143391 is a wasteful number, since it uses less digits than its factorization.

12143391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3142.

The product of its digits is 648, while the sum is 24.

The square root of 12143391 is about 3484.7368623757. The cubic root of 12143391 is about 229.8511387090.

The spelling of 12143391 in words is "twelve million, one hundred forty-three thousand, three hundred ninety-one".