380021 has 4 divisors (see below), whose sum is σ = 381612. Its totient is φ = 378432.

The previous prime is 379999. The next prime is 380041. The reversal of 380021 is 120083.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 372100 + 7921 = 610^2 + 89^2 .

It is a cyclic number.

It is not a de Polignac number, because 380021 - 2¹⁰ = 378997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 379978 and 380005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (380041) 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 3 ways as a sum of consecutive naturals, for example, 356 + ... + 941.

It is an arithmetic number, because the mean of its divisors is an integer number (95403).

2³⁸⁰⁰²¹ is an apocalyptic number.

It is an amenable number.

380021 is a deficient number, since it is larger than the sum of its proper divisors (1591).

380021 is a wasteful number, since it uses less digits than its factorization.

380021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 380021 is about 616.4584333108. The cubic root of 380021 is about 72.4328986755.

Subtracting from 380021 its product of nonzero digits (48), we obtain a palindrome (379973).

It can be divided in two parts, 3800 and 21, that multiplied together give a triangular number (79800 = T₃₉₉).

The spelling of 380021 in words is "three hundred eighty thousand, twenty-one".