12321428 has 24 divisors (see below), whose sum is σ = 24724224. Its totient is φ = 5263200.

The previous prime is 12321409. The next prime is 12321431. The reversal of 12321428 is 82412321.

It is a happy number.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11558 + ... + 12578.

It is an arithmetic number, because the mean of its divisors is an integer number (1030176).

Almost surely, 2^12321428 is an apocalyptic number.

It is an amenable number.

12321428 is an abundant number, since it is smaller than the sum of its proper divisors (12402796).

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

12321428 is a wasteful number, since it uses less digits than its factorization.

12321428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463 (or 1461 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 12321428 is about 3510.1891686916. The cubic root of 12321428 is about 230.9689931708.

Adding to 12321428 its reverse (82412321), we get a palindrome (94733749).

The spelling of 12321428 in words is "twelve million, three hundred twenty-one thousand, four hundred twenty-eight".