12023478 has 20 divisors (see below), whose sum is σ = 26941860. Its totient is φ = 4007772.

The previous prime is 12023477. The next prime is 12023489. The reversal of 12023478 is 87432021.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12023477) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 36948 + ... + 37271.

It is an arithmetic number, because the mean of its divisors is an integer number (1347093).

Almost surely, 2^12023478 is an apocalyptic number.

12023478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12023478 is an abundant number, since it is smaller than the sum of its proper divisors (14918382).

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

12023478 is an equidigital number, since it uses as much as digits as its factorization.

12023478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74233 (or 74224 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 12023478 is about 3467.4887166363. The cubic root of 12023478 is about 229.0920601365.

Adding to 12023478 its reverse (87432021), we get a palindrome (99455499).

The spelling of 12023478 in words is "twelve million, twenty-three thousand, four hundred seventy-eight".