12135854 has 4 divisors (see below), whose sum is σ = 18203784. Its totient is φ = 6067926.

The previous prime is 12135853. The next prime is 12135859. The reversal of 12135854 is 45853121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45853121 = 2293 ⋅19997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12135853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3033962 + ... + 3033965.

It is an arithmetic number, because the mean of its divisors is an integer number (4550946).

Almost surely, 2^12135854 is an apocalyptic number.

12135854 is a deficient number, since it is larger than the sum of its proper divisors (6067930).

12135854 is an equidigital number, since it uses as much as digits as its factorization.

12135854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6067929.

The product of its digits is 4800, while the sum is 29.

The square root of 12135854 is about 3483.6552642304. The cubic root of 12135854 is about 229.8035752080.

Adding to 12135854 its reverse (45853121), we get a palindrome (57988975).

It can be divided in two parts, 121 and 35854, that multiplied together give a palindrome (4338334).

The spelling of 12135854 in words is "twelve million, one hundred thirty-five thousand, eight hundred fifty-four".