12139297 has 4 divisors (see below), whose sum is σ = 12165120. Its totient is φ = 12113476.

The previous prime is 12139289. The next prime is 12139307. The reversal of 12139297 is 79293121.

It is a happy number.

12139297 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12139297 - 2³ = 12139289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12139247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12193 + ... + 13150.

It is an arithmetic number, because the mean of its divisors is an integer number (3041280).

Almost surely, 2^12139297 is an apocalyptic number.

It is an amenable number.

12139297 is a deficient number, since it is larger than the sum of its proper divisors (25823).

12139297 is an equidigital number, since it uses as much as digits as its factorization.

12139297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25822.

The product of its digits is 6804, while the sum is 34.

The square root of 12139297 is about 3484.1493940415. The cubic root of 12139297 is about 229.8253052788.

It can be divided in two parts, 1213929 and 7, that multiplied together give a triangular number (8497503 = T₄₁₂₂).

The spelling of 12139297 in words is "twelve million, one hundred thirty-nine thousand, two hundred ninety-seven".