381870 has 24 divisors (see below), whose sum is σ = 993096. Its totient is φ = 101808.

The previous prime is 381859. The next prime is 381911. The reversal of 381870 is 78183.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381870.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2032 + ... + 2211.

It is an arithmetic number, because the mean of its divisors is an integer number (41379).

2³⁸¹⁸⁷⁰ is an apocalyptic number.

381870 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

381870 is an abundant number, since it is smaller than the sum of its proper divisors (611226).

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

381870 is a wasteful number, since it uses less digits than its factorization.

381870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4256 (or 4253 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 381870 is about 617.9563091352. The cubic root of 381870 is about 72.5501832505.

The spelling of 381870 in words is "three hundred eighty-one thousand, eight hundred seventy".