12135947 has 4 divisors (see below), whose sum is σ = 12146160. Its totient is φ = 12125736.

The previous prime is 12135941. The next prime is 12135967. The reversal of 12135947 is 74953121.

12135947 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 brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 74953121 = 1669 ⋅44909.

It is a cyclic number.

It is not a de Polignac number, because 12135947 - 2⁴ = 12135931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12135941) 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, 3047 + ... + 5792.

It is an arithmetic number, because the mean of its divisors is an integer number (3036540).

Almost surely, 2^12135947 is an apocalyptic number.

12135947 is a deficient number, since it is larger than the sum of its proper divisors (10213).

12135947 is an equidigital number, since it uses as much as digits as its factorization.

12135947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10212.

The product of its digits is 7560, while the sum is 32.

The square root of 12135947 is about 3483.6686122535. The cubic root of 12135947 is about 229.8041622201.

The spelling of 12135947 in words is "twelve million, one hundred thirty-five thousand, nine hundred forty-seven".