12120381840 has 80 divisors (see below), whose sum is σ = 42940787328. Its totient is φ = 2770372608.

The previous prime is 12120381821. The next prime is 12120381853. The reversal of 12120381840 is 4818302121.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 12120381798 and 12120381807.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3605577 + ... + 3608936.

Almost surely, 2^12120381840 is an apocalyptic number.

12120381840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12120381840 is an abundant number, since it is smaller than the sum of its proper divisors (30820405488).

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

12120381840 is a wasteful number, since it uses less digits than its factorization.

12120381840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7214536 (or 7214530 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

Adding to 12120381840 its reverse (4818302121), we get a palindrome (16938683961).

The spelling of 12120381840 in words is "twelve billion, one hundred twenty million, three hundred eighty-one thousand, eight hundred forty".