2381156640 has 144 divisors (see below), whose sum is σ = 8143244928. Its totient is φ = 633604608.

The previous prime is 2381156639. The next prime is 2381156653. The reversal of 2381156640 is 466511832.

It is a happy number.

2381156640 is a `hidden beast` number, since 2 + 3 + 8 + 1 + 1 + 5 + 6 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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 = 2381156595 and 2381156604.

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, 786169 + ... + 789191.

It is an arithmetic number, because the mean of its divisors is an integer number (56550312).

Almost surely, 2^2381156640 is an apocalyptic number.

2381156640 is a gapful number since it is divisible by the number (20) 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 2381156640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4071622464).

2381156640 is an abundant number, since it is smaller than the sum of its proper divisors (5762088288).

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

2381156640 is a wasteful number, since it uses less digits than its factorization.

2381156640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3591 (or 3580 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 2381156640 is about 48797.0966349434. The cubic root of 2381156640 is about 1335.3526989667.

The spelling of 2381156640 in words is "two billion, three hundred eighty-one million, one hundred fifty-six thousand, six hundred forty".