12178542 has 16 divisors (see below), whose sum is σ = 24486912. Its totient is φ = 4037880.

The previous prime is 12178541. The next prime is 12178547. The reversal of 12178542 is 24587121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12178541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4168 + ... + 6459.

It is an arithmetic number, because the mean of its divisors is an integer number (1530432).

Almost surely, 2^12178542 is an apocalyptic number.

12178542 is an abundant number, since it is smaller than the sum of its proper divisors (12308370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12178542 is a wasteful number, since it uses less digits than its factorization.

12178542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10823.

The product of its digits is 4480, while the sum is 30.

The square root of 12178542 is about 3489.7767836926. The cubic root of 12178542 is about 230.0727054330.

It can be divided in two parts, 12178 and 542, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 12178542 in words is "twelve million, one hundred seventy-eight thousand, five hundred forty-two".