12540455 has 4 divisors (see below), whose sum is σ = 15048552. Its totient is φ = 10032360.

The previous prime is 12540449. The next prime is 12540467. The reversal of 12540455 is 55404521.

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

It is a de Polignac number, because none of the positive numbers 2^k-12540455 is a prime.

It is a Duffinian 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, 1254041 + ... + 1254050.

It is an arithmetic number, because the mean of its divisors is an integer number (3762138).

Almost surely, 2^12540455 is an apocalyptic number.

12540455 is a deficient number, since it is larger than the sum of its proper divisors (2508097).

12540455 is an equidigital number, since it uses as much as digits as its factorization.

12540455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2508096.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 12540455 is about 3541.2504853512. The cubic root of 12540455 is about 232.3295393707.

Adding to 12540455 its reverse (55404521), we get a palindrome (67944976).

The spelling of 12540455 in words is "twelve million, five hundred forty thousand, four hundred fifty-five".