12542405 has 4 divisors (see below), whose sum is σ = 15050892. Its totient is φ = 10033920.

The previous prime is 12542401. The next prime is 12542423. The reversal of 12542405 is 50424521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50424521 = 7 ⋅7203503.

It can be written as a sum of positive squares in 2 ways, for example, as 1999396 + 10543009 = 1414^2 + 3247^2 .

It is not a de Polignac number, because 12542405 - 2² = 12542401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12542401) 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, 1254236 + ... + 1254245.

It is an arithmetic number, because the mean of its divisors is an integer number (3762723).

Almost surely, 2^12542405 is an apocalyptic number.

It is an amenable number.

12542405 is a deficient number, since it is larger than the sum of its proper divisors (2508487).

12542405 is an equidigital number, since it uses as much as digits as its factorization.

12542405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2508486.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 12542405 is about 3541.5258011202. The cubic root of 12542405 is about 232.3415809093.

Adding to 12542405 its reverse (50424521), we get a palindrome (62966926).

The spelling of 12542405 in words is "twelve million, five hundred forty-two thousand, four hundred five".