381745 has 16 divisors (see below), whose sum is σ = 564480. Its totient is φ = 241344.

The previous prime is 381739. The next prime is 381749. The reversal of 381745 is 547183.

It is a cyclic number.

It is not a de Polignac number, because 381745 - 2³ = 381737 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (381749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36 + ... + 874.

It is an arithmetic number, because the mean of its divisors is an integer number (35280).

2³⁸¹⁷⁴⁵ is an apocalyptic number.

381745 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

381745 is a deficient number, since it is larger than the sum of its proper divisors (182735).

381745 is a wasteful number, since it uses less digits than its factorization.

381745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864.

The product of its digits is 3360, while the sum is 28.

The square root of 381745 is about 617.8551610208. The cubic root of 381745 is about 72.5422662782.

The spelling of 381745 in words is "three hundred eighty-one thousand, seven hundred forty-five".