381831860 has 48 divisors (see below), whose sum is σ = 826447104. Its totient is φ = 148076928.

The previous prime is 381831851. The next prime is 381831871. The reversal of 381831860 is 68138183.

It is a super-2 number, since 2×381831860² = 291591138622119200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256037 + ... + 257523.

It is an arithmetic number, because the mean of its divisors is an integer number (17217648).

Almost surely, 2^381831860 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 381831860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (413223552).

381831860 is an abundant number, since it is smaller than the sum of its proper divisors (444615244).

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

381831860 is a wasteful number, since it uses less digits than its factorization.

381831860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880 (or 1878 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 381831860 is about 19540.5184168691. The cubic root of 381831860 is about 725.4776780705.

The spelling of 381831860 in words is "three hundred eighty-one million, eight hundred thirty-one thousand, eight hundred sixty".