12172387 has 2 divisors, whose sum is σ = 12172388. Its totient is φ = 12172386.

The previous prime is 12172361. The next prime is 12172393. The reversal of 12172387 is 78327121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12172387 - 2¹⁵ = 12139619 is a prime.

It is equal to p₇₉₈₆₀₁ and since 12172387 and 798601 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12172327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6086193 + 6086194.

It is an arithmetic number, because the mean of its divisors is an integer number (6086194).

Almost surely, 2^12172387 is an apocalyptic number.

12172387 is a deficient number, since it is larger than the sum of its proper divisors (1).

12172387 is an equidigital number, since it uses as much as digits as its factorization.

12172387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 31.

The square root of 12172387 is about 3488.8948106815. The cubic root of 12172387 is about 230.0339395410.

The spelling of 12172387 in words is "twelve million, one hundred seventy-two thousand, three hundred eighty-seven".