12021478 has 16 divisors (see below), whose sum is σ = 20655360. Its totient is φ = 5140296.

The previous prime is 12021473. The next prime is 12021491. The reversal of 12021478 is 87412021.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021473) 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, 8575 + ... + 9877.

It is an arithmetic number, because the mean of its divisors is an integer number (1290960).

Almost surely, 2^12021478 is an apocalyptic number.

12021478 is a deficient number, since it is larger than the sum of its proper divisors (8633882).

12021478 is a wasteful number, since it uses less digits than its factorization.

12021478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 12021478 is about 3467.2003114905. The cubic root of 12021478 is about 229.0793569478.

Adding to 12021478 its reverse (87412021), we get a palindrome (99433499).

The spelling of 12021478 in words is "twelve million, twenty-one thousand, four hundred seventy-eight".