381720 has 32 divisors (see below), whose sum is σ = 1145520. Its totient is φ = 101760.

The previous prime is 381713. The next prime is 381737. The reversal of 381720 is 27183.

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 381720.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1471 + ... + 1710.

2³⁸¹⁷²⁰ is an apocalyptic number.

381720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

381720 is an abundant number, since it is smaller than the sum of its proper divisors (763800).

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

381720 is a wasteful number, since it uses less digits than its factorization.

381720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195 (or 3191 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 381720 is about 617.8349294108. The cubic root of 381720 is about 72.5406826764.

The spelling of 381720 in words is "three hundred eighty-one thousand, seven hundred twenty".