12208240 has 40 divisors (see below), whose sum is σ = 30966768. Its totient is φ = 4439040.

The previous prime is 12208213. The next prime is 12208247. The reversal of 12208240 is 4280221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×12208240² = 298082247795200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12208247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6057 + ... + 7816.

Almost surely, 2^12208240 is an apocalyptic number.

12208240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12208240 is an abundant number, since it is smaller than the sum of its proper divisors (18758528).

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

12208240 is a wasteful number, since it uses less digits than its factorization.

12208240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13897 (or 13891 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 12208240 is about 3494.0291927802. The cubic root of 12208240 is about 230.2595683256.

Adding to 12208240 its reverse (4280221), we get a palindrome (16488461).

The spelling of 12208240 in words is "twelve million, two hundred eight thousand, two hundred forty".