12279920 has 20 divisors (see below), whose sum is σ = 28551000. Its totient is φ = 4911936.

The previous prime is 12279919. The next prime is 12279959. The reversal of 12279920 is 2997221.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 76670 + ... + 76829.

It is an arithmetic number, because the mean of its divisors is an integer number (1427550).

Almost surely, 2^12279920 is an apocalyptic number.

12279920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12279920 is an abundant number, since it is smaller than the sum of its proper divisors (16271080).

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

12279920 is a wasteful number, since it uses less digits than its factorization.

12279920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153512 (or 153506 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 12279920 is about 3504.2716789655. The cubic root of 12279920 is about 230.7093412679.

The spelling of 12279920 in words is "twelve million, two hundred seventy-nine thousand, nine hundred twenty".