12209840 has 20 divisors (see below), whose sum is σ = 28388064. Its totient is φ = 4883904.

The previous prime is 12209833. The next prime is 12209861. The reversal of 12209840 is 4890221.

12209840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76232 + ... + 76391.

Almost surely, 2^12209840 is an apocalyptic number.

12209840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12209840 is an abundant number, since it is smaller than the sum of its proper divisors (16178224).

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

12209840 is a wasteful number, since it uses less digits than its factorization.

12209840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152636 (or 152630 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 12209840 is about 3494.2581473039. The cubic root of 12209840 is about 230.2696270841.

The spelling of 12209840 in words is "twelve million, two hundred nine thousand, eight hundred forty".