12320388 has 18 divisors (see below), whose sum is σ = 31143294. Its totient is φ = 4106784.

The previous prime is 12320369. The next prime is 12320401. The reversal of 12320388 is 88302321.

It can be written as a sum of positive squares in only one way, i.e., 9437184 + 2883204 = 3072^2 + 1698^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 171081 + ... + 171152.

It is an arithmetic number, because the mean of its divisors is an integer number (1730183).

Almost surely, 2^12320388 is an apocalyptic number.

12320388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12320388 is an abundant number, since it is smaller than the sum of its proper divisors (18822906).

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

12320388 is a wasteful number, since it uses less digits than its factorization.

12320388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342243 (or 342238 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 12320388 is about 3510.0410254013. The cubic root of 12320388 is about 230.9624946137.

It can be divided in two parts, 12 and 320388, that added together give a triangular number (320400 = T₈₀₀).

The spelling of 12320388 in words is "twelve million, three hundred twenty thousand, three hundred eighty-eight".