2381311836 has 72 divisors (see below), whose sum is σ = 6148671984. Its totient is φ = 776805120.

The previous prime is 2381311817. The next prime is 2381311847. The reversal of 2381311836 is 6381131832.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2381311836.

It is a congruent number.

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, 870591 + ... + 873321.

It is an arithmetic number, because the mean of its divisors is an integer number (85398222).

Almost surely, 2^2381311836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2381311836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3074335992).

2381311836 is an abundant number, since it is smaller than the sum of its proper divisors (3767360148).

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

2381311836 is a wasteful number, since it uses less digits than its factorization.

2381311836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3251 (or 3246 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 2381311836 is about 48798.6868265940. The cubic root of 2381311836 is about 1335.3817096433.

The spelling of 2381311836 in words is "two billion, three hundred eighty-one million, three hundred eleven thousand, eight hundred thirty-six".