12278542 has 16 divisors (see below), whose sum is σ = 19670400. Its totient is φ = 5735520.

The previous prime is 12278537. The next prime is 12278543. The reversal of 12278542 is 24587221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12278543) 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, 1617 + ... + 5212.

It is an arithmetic number, because the mean of its divisors is an integer number (1229400).

Almost surely, 2^12278542 is an apocalyptic number.

12278542 is a deficient number, since it is larger than the sum of its proper divisors (7391858).

12278542 is a wasteful number, since it uses less digits than its factorization.

12278542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6891.

The product of its digits is 8960, while the sum is 31.

The square root of 12278542 is about 3504.0750562738. The cubic root of 12278542 is about 230.7007112072.

The spelling of 12278542 in words is "twelve million, two hundred seventy-eight thousand, five hundred forty-two".