12157445 has 4 divisors (see below), whose sum is σ = 14588940. Its totient is φ = 9725952.

The previous prime is 12157429. The next prime is 12157459. The reversal of 12157445 is 54475121.

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 6770404 + 5387041 = 2602^2 + 2321^2 .

It is a cyclic number.

It is not a de Polignac number, because 12157445 - 2⁴ = 12157429 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1215740 + ... + 1215749.

It is an arithmetic number, because the mean of its divisors is an integer number (3647235).

Almost surely, 2^12157445 is an apocalyptic number.

It is an amenable number.

12157445 is a deficient number, since it is larger than the sum of its proper divisors (2431495).

12157445 is an equidigital number, since it uses as much as digits as its factorization.

12157445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431494.

The product of its digits is 5600, while the sum is 29.

The square root of 12157445 is about 3486.7527873367. The cubic root of 12157445 is about 229.9397762928.

The spelling of 12157445 in words is "twelve million, one hundred fifty-seven thousand, four hundred forty-five".