12321690 has 32 divisors (see below), whose sum is σ = 31129920. Its totient is φ = 3112704.

The previous prime is 12321679. The next prime is 12321691. The reversal of 12321690 is 9612321.

It is a super-2 number, since 2×12321690² = 303648088912200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 12321690.

It is not an unprimeable number, because it can be changed into a prime (12321691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10239 + ... + 11378.

It is an arithmetic number, because the mean of its divisors is an integer number (972810).

Almost surely, 2^12321690 is an apocalyptic number.

12321690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12321690 is an abundant number, since it is smaller than the sum of its proper divisors (18808230).

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

12321690 is a wasteful number, since it uses less digits than its factorization.

12321690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21646.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 12321690 is about 3510.2264884192. The cubic root of 12321690 is about 230.9706302497.

The spelling of 12321690 in words is "twelve million, three hundred twenty-one thousand, six hundred ninety".