12172149 has 24 divisors (see below), whose sum is σ = 19704672. Its totient is φ = 7175520.

The previous prime is 12172133. The next prime is 12172151. The reversal of 12172149 is 94127121.

12172149 = T₁₁ + T₁₂ + ... + T₄₁₇.

It is not a de Polignac number, because 12172149 - 2⁴ = 12172133 is a prime.

It is a super-2 number, since 2×12172149² = 296322422556402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12172189) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2002 + ... + 5324.

It is an arithmetic number, because the mean of its divisors is an integer number (821028).

Almost surely, 2^12172149 is an apocalyptic number.

It is an amenable number.

12172149 is a deficient number, since it is larger than the sum of its proper divisors (7532523).

12172149 is a wasteful number, since it uses less digits than its factorization.

12172149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3377 (or 3374 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 12172149 is about 3488.8607022924. The cubic root of 12172149 is about 230.0324402888.

It can be divided in two parts, 12172 and 149, that added together give a palindrome (12321).

The spelling of 12172149 in words is "twelve million, one hundred seventy-two thousand, one hundred forty-nine".