12147905 has 32 divisors (see below), whose sum is σ = 18385920. Its totient is φ = 7485120.

The previous prime is 12147899. The next prime is 12147907. The reversal of 12147905 is 50974121.

12147905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12147905 - 2¹⁰ = 12146881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12147907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53402 + ... + 53628.

It is an arithmetic number, because the mean of its divisors is an integer number (574560).

Almost surely, 2^12147905 is an apocalyptic number.

It is an amenable number.

12147905 is a deficient number, since it is larger than the sum of its proper divisors (6238015).

12147905 is a wasteful number, since it uses less digits than its factorization.

12147905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 12147905 is about 3485.3844838124. The cubic root of 12147905 is about 229.8796156395.

It can be divided in two parts, 1214 and 7905, that added together give a palindrome (9119).

The spelling of 12147905 in words is "twelve million, one hundred forty-seven thousand, nine hundred five".