12153805 has 4 divisors (see below), whose sum is σ = 14584572. Its totient is φ = 9723040.

The previous prime is 12153803. The next prime is 12153847. The reversal of 12153805 is 50835121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1798281 + 10355524 = 1341^2 + 3218^2 .

It is not a de Polignac number, because 12153805 - 2¹ = 12153803 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12153805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12153803) 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, 1215376 + ... + 1215385.

It is an arithmetic number, because the mean of its divisors is an integer number (3646143).

Almost surely, 2^12153805 is an apocalyptic number.

It is an amenable number.

12153805 is a deficient number, since it is larger than the sum of its proper divisors (2430767).

12153805 is an equidigital number, since it uses as much as digits as its factorization.

12153805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430766.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 12153805 is about 3486.2307726254. The cubic root of 12153805 is about 229.9168256281.

Adding to 12153805 its reverse (50835121), we get a palindrome (62988926).

The spelling of 12153805 in words is "twelve million, one hundred fifty-three thousand, eight hundred five".