381172018500 has 1152 divisors, whose sum is σ = 1541770094592. Its totient is φ = 77137920000.

The previous prime is 381172018489. The next prime is 381172018501. The reversal of 381172018500 is 5810271183.

381172018500 is a `hidden beast` number, since 3 + 8 + 117 + 20 + 18 + 500 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (381172018501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 1225633345 + ... + 1225633655.

It is an arithmetic number, because the mean of its divisors is an integer number (1338342096).

Almost surely, 2^381172018500 is an apocalyptic number.

381172018500 is a gapful number since it is divisible by the number (30) 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 381172018500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (770885047296).

381172018500 is an abundant number, since it is smaller than the sum of its proper divisors (1160598076092).

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

381172018500 is a wasteful number, since it uses less digits than its factorization.

381172018500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470 (or 455 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

Adding to 381172018500 its reverse (5810271183), we get a palindrome (386982289683).

The spelling of 381172018500 in words is "three hundred eighty-one billion, one hundred seventy-two million, eighteen thousand, five hundred".