12138417 has 20 divisors (see below), whose sum is σ = 18231796. Its totient is φ = 8048160.

The previous prime is 12138409. The next prime is 12138421. The reversal of 12138417 is 71483121.

It can be written as a sum of positive squares in 2 ways, for example, as 3370896 + 8767521 = 1836^2 + 2961^2 .

It is not a de Polignac number, because 12138417 - 2³ = 12138409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12138487) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22167 + ... + 22707.

Almost surely, 2^12138417 is an apocalyptic number.

It is an amenable number.

12138417 is a deficient number, since it is larger than the sum of its proper divisors (6093379).

12138417 is an equidigital number, since it uses as much as digits as its factorization.

12138417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830 (or 821 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 12138417 is about 3484.0231055491. The cubic root of 12138417 is about 229.8197516580.

The spelling of 12138417 in words is "twelve million, one hundred thirty-eight thousand, four hundred seventeen".