12389309640 has 320 divisors, whose sum is σ = 45125372160. Its totient is φ = 3036579840.

The previous prime is 12389309633. The next prime is 12389309671. The reversal of 12389309640 is 4690398321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2365825 + ... + 2371055.

It is an arithmetic number, because the mean of its divisors is an integer number (141016788).

Almost surely, 2^12389309640 is an apocalyptic number.

12389309640 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 12389309640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22562686080).

12389309640 is an abundant number, since it is smaller than the sum of its proper divisors (32736062520).

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

12389309640 is a wasteful number, since it uses less digits than its factorization.

12389309640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5314 (or 5301 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 12389309640 in words is "twelve billion, three hundred eighty-nine million, three hundred nine thousand, six hundred forty".