381897 has 6 divisors (see below), whose sum is σ = 551642. Its totient is φ = 254592.

The previous prime is 381859. The next prime is 381911. The reversal of 381897 is 798183.

It can be written as a sum of positive squares in only one way, i.e., 335241 + 46656 = 579^2 + 216^2 .

It is not a de Polignac number, because 381897 - 2¹¹ = 379849 is a prime.

It is a Duffinian number.

381897 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (381817) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 21208 + ... + 21225.

2³⁸¹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

381897 is a deficient number, since it is larger than the sum of its proper divisors (169745).

381897 is a wasteful number, since it uses less digits than its factorization.

381897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42439 (or 42436 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 381897 is about 617.9781549537. The cubic root of 381897 is about 72.5518930896.

The spelling of 381897 in words is "three hundred eighty-one thousand, eight hundred ninety-seven".