12398379840 has 840 divisors, whose sum is σ = 54605517408. Its totient is φ = 2560481280.

The previous prime is 12398379821. The next prime is 12398379841. The reversal of 12398379840 is 4897389321.

It is a tau number, because it is divible by the number of its divisors (840).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12398379841) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 76063599 + ... + 76063761.

Almost surely, 2^12398379840 is an apocalyptic number.

12398379840 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 12398379840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27302758704).

12398379840 is an abundant number, since it is smaller than the sum of its proper divisors (42207137568).

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

12398379840 is a wasteful number, since it uses less digits than its factorization.

12398379840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 12398379840 in words is "twelve billion, three hundred ninety-eight million, three hundred seventy-nine thousand, eight hundred forty".