12398940 has 48 divisors (see below), whose sum is σ = 38576160. Its totient is φ = 3306240.

The previous prime is 12398879. The next prime is 12398941. The reversal of 12398940 is 4989321.

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

It is a junction number, because it is equal to n+sod(n) for n = 12398895 and 12398904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12398941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10941 + ... + 12020.

It is an arithmetic number, because the mean of its divisors is an integer number (803670).

Almost surely, 2^12398940 is an apocalyptic number.

12398940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12398940 is an abundant number, since it is smaller than the sum of its proper divisors (26177220).

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

12398940 is a wasteful number, since it uses less digits than its factorization.

12398940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22979 (or 22971 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 12398940 is about 3521.2128592290. The cubic root of 12398940 is about 231.4523099302.

The spelling of 12398940 in words is "twelve million, three hundred ninety-eight thousand, nine hundred forty".