12499920 has 120 divisors (see below), whose sum is σ = 43601376. Its totient is φ = 3328128.

The previous prime is 12499919. The next prime is 12499987. The reversal of 12499920 is 2999421.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19119 + ... + 19761.

Almost surely, 2^12499920 is an apocalyptic number.

12499920 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 12499920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21800688).

12499920 is an abundant number, since it is smaller than the sum of its proper divisors (31101456).

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

12499920 is an equidigital number, since it uses as much as digits as its factorization.

12499920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 12499920 is about 3535.5225922061. The cubic root of 12499920 is about 232.0789465768.

The spelling of 12499920 in words is "twelve million, four hundred ninety-nine thousand, nine hundred twenty".