12658240 has 56 divisors (see below), whose sum is σ = 34454592. Its totient is φ = 4339200.

The previous prime is 12658231. The next prime is 12658241. The reversal of 12658240 is 4285621.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 12658199 and 12658208.

It is not an unprimeable number, because it can be changed into a prime (12658241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 586 + ... + 5065.

Almost surely, 2^12658240 is an apocalyptic number.

12658240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12658240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17227296).

12658240 is an abundant number, since it is smaller than the sum of its proper divisors (21796352).

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

12658240 is an equidigital number, since it uses as much as digits as its factorization.

12658240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5675 (or 5665 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 12658240 is about 3557.8420425871. The cubic root of 12658240 is about 233.0546514154.

The spelling of 12658240 in words is "twelve million, six hundred fifty-eight thousand, two hundred forty".