381660 has 24 divisors (see below), whose sum is σ = 1068816. Its totient is φ = 101760.

The previous prime is 381659. The next prime is 381673. The reversal of 381660 is 66183.

It is a self number, because there is not a number n which added to its sum of digits gives 381660.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3121 + ... + 3240.

It is an arithmetic number, because the mean of its divisors is an integer number (44534).

2³⁸¹⁶⁶⁰ is an apocalyptic number.

381660 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

381660 is an abundant number, since it is smaller than the sum of its proper divisors (687156).

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

381660 is a wasteful number, since it uses less digits than its factorization.

381660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6373 (or 6371 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 381660 is about 617.7863708435. The cubic root of 381660 is about 72.5368817498.

The spelling of 381660 in words is "three hundred eighty-one thousand, six hundred sixty".