383981 has 4 divisors (see below), whose sum is σ = 413532. Its totient is φ = 354432.

The previous prime is 383969. The next prime is 383983. The reversal of 383981 is 189383.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189383 = 229 ⋅827.

It can be written as a sum of positive squares in 2 ways, for example, as 17956 + 366025 = 134^2 + 605^2 .

It is not a de Polignac number, because 383981 - 2⁶ = 383917 is a prime.

It is a super-2 number, since 2×383981² = 294882816722, which contains 22 as substring.

It is a Duffinian number.

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 383981.

It is not an unprimeable number, because it can be changed into a prime (383983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14756 + ... + 14781.

It is an arithmetic number, because the mean of its divisors is an integer number (103383).

2³⁸³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

383981 is a deficient number, since it is larger than the sum of its proper divisors (29551).

383981 is a wasteful number, since it uses less digits than its factorization.

383981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29550.

The product of its digits is 5184, while the sum is 32.

The square root of 383981 is about 619.6620046445. The cubic root of 383981 is about 72.6836248987.

The spelling of 383981 in words is "three hundred eighty-three thousand, nine hundred eighty-one".