382705921 has 8 divisors (see below), whose sum is σ = 436388904. Its totient is φ = 332486400.

The previous prime is 382705909. The next prime is 382705927. The reversal of 382705921 is 129507283.

It can be written as a sum of positive squares in 4 ways, for example, as 698896 + 382007025 = 836^2 + 19545^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 382705921 - 2⁹ = 382705409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (382705927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865630 + ... + 866071.

It is an arithmetic number, because the mean of its divisors is an integer number (54548613).

Almost surely, 2^382705921 is an apocalyptic number.

It is an amenable number.

382705921 is a deficient number, since it is larger than the sum of its proper divisors (53682983).

382705921 is a wasteful number, since it uses less digits than its factorization.

382705921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731731.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 382705921 is about 19562.8709805079. The cubic root of 382705921 is about 726.0308259975.

The spelling of 382705921 in words is "three hundred eighty-two million, seven hundred five thousand, nine hundred twenty-one".