12555442 has 4 divisors (see below), whose sum is σ = 18833166. Its totient is φ = 6277720.

The previous prime is 12555397. The next prime is 12555443. The reversal of 12555442 is 24455521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24455521 = 139 ⋅175939.

It can be written as a sum of positive squares in only one way, i.e., 9803161 + 2752281 = 3131^2 + 1659^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12555442.

It is not an unprimeable number, because it can be changed into a prime (12555443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3138859 + ... + 3138862.

Almost surely, 2^12555442 is an apocalyptic number.

12555442 is a deficient number, since it is larger than the sum of its proper divisors (6277724).

12555442 is an equidigital number, since it uses as much as digits as its factorization.

12555442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6277723.

The product of its digits is 8000, while the sum is 28.

The square root of 12555442 is about 3543.3659139299. The cubic root of 12555442 is about 232.4220542662.

The spelling of 12555442 in words is "twelve million, five hundred fifty-five thousand, four hundred forty-two".