381559860 has 144 divisors (see below), whose sum is σ = 1275124032. Its totient is φ = 91584000.

The previous prime is 381559853. The next prime is 381559877. The reversal of 381559860 is 68955183.

381559860 is a `hidden beast` number, since 38 + 1 + 559 + 8 + 60 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 210960 + ... + 212760.

It is an arithmetic number, because the mean of its divisors is an integer number (8855028).

Almost surely, 2^381559860 is an apocalyptic number.

381559860 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 381559860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (637562016).

381559860 is an abundant number, since it is smaller than the sum of its proper divisors (893564172).

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

381559860 is a wasteful number, since it uses less digits than its factorization.

381559860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934 (or 1929 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 381559860 is about 19533.5572797174. The cubic root of 381559860 is about 725.3053711609.

The spelling of 381559860 in words is "three hundred eighty-one million, five hundred fifty-nine thousand, eight hundred sixty".