383825921 has 4 divisors (see below), whose sum is σ = 384350292. Its totient is φ = 383301552.

The previous prime is 383825903. The next prime is 383825963. The reversal of 383825921 is 129528383.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129528383 = 5827 ⋅22229.

It can be written as a sum of positive squares in 2 ways, for example, as 235960321 + 147865600 = 15361^2 + 12160^2 .

It is a cyclic number.

It is not a de Polignac number, because 383825921 - 2¹⁸ = 383563777 is a prime.

It is a Duffinian number.

It is a zygodrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (383825971) 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, 261086 + ... + 262551.

It is an arithmetic number, because the mean of its divisors is an integer number (96087573).

Almost surely, 2^383825921 is an apocalyptic number.

It is an amenable number.

383825921 is a deficient number, since it is larger than the sum of its proper divisors (524371).

383825921 is an equidigital number, since it uses as much as digits as its factorization.

383825921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524370.

The product of its digits is 103680, while the sum is 41.

The square root of 383825921 is about 19591.4757228750. The cubic root of 383825921 is about 726.7383863178.

The spelling of 383825921 in words is "three hundred eighty-three million, eight hundred twenty-five thousand, nine hundred twenty-one".