380781 has 12 divisors (see below), whose sum is σ = 570752. Its totient is φ = 253692.

The previous prime is 380777. The next prime is 380797. The reversal of 380781 is 187083.

It is not a de Polignac number, because 380781 - 2² = 380777 is a prime.

It is a super-2 number, since 2×380781² = 289988339922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (380881) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 541 + ... + 1026.

2³⁸⁰⁷⁸¹ is an apocalyptic number.

It is an amenable number.

380781 is a deficient number, since it is larger than the sum of its proper divisors (189971).

380781 is an equidigital number, since it uses as much as digits as its factorization.

380781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582 (or 1570 counting only the distinct ones).

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

The square root of 380781 is about 617.0745497912. The cubic root of 380781 is about 72.4811524531.

The spelling of 380781 in words is "three hundred eighty thousand, seven hundred eighty-one".