12171456 has 168 divisors, whose sum is σ = 40654224. Its totient is φ = 3440640.

The previous prime is 12171433. The next prime is 12171469. The reversal of 12171456 is 65417121.

It is a happy number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 107656 + ... + 107768.

Almost surely, 2^12171456 is an apocalyptic number.

12171456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12171456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20327112).

12171456 is an abundant number, since it is smaller than the sum of its proper divisors (28482768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12171456 is a wasteful number, since it uses less digits than its factorization.

12171456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 146 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 12171456 is about 3488.7613847897. The cubic root of 12171456 is about 230.0280747078.

Adding to 12171456 its reverse (65417121), we get a palindrome (77588577).

The spelling of 12171456 in words is "twelve million, one hundred seventy-one thousand, four hundred fifty-six".