12135457 has 4 divisors (see below), whose sum is σ = 12142660. Its totient is φ = 12128256.

The previous prime is 12135451. The next prime is 12135469. The reversal of 12135457 is 75453121.

It is a happy number.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 136161 + 11999296 = 369^2 + 3464^2 .

It is a cyclic number.

It is not a de Polignac number, because 12135457 - 2¹⁵ = 12102689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12135451) 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, 433 + ... + 4945.

It is an arithmetic number, because the mean of its divisors is an integer number (3035665).

Almost surely, 2^12135457 is an apocalyptic number.

It is an amenable number.

12135457 is a deficient number, since it is larger than the sum of its proper divisors (7203).

12135457 is an equidigital number, since it uses as much as digits as its factorization.

12135457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7202.

The product of its digits is 4200, while the sum is 28.

The square root of 12135457 is about 3483.5982833846. The cubic root of 12135457 is about 229.8010693271.

Adding to 12135457 its reverse (75453121), we get a palindrome (87588578).

It can be divided in two parts, 1213 and 5457, that multiplied together give a triangular number (6619341 = T₃₆₃₈).

The spelling of 12135457 in words is "twelve million, one hundred thirty-five thousand, four hundred fifty-seven".