382728421 has 4 divisors (see below), whose sum is σ = 385650144. Its totient is φ = 379806700.

The previous prime is 382728397. The next prime is 382728461. The reversal of 382728421 is 124827283.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 382728421 - 2¹³ = 382720229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (382728461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1460665 + ... + 1460926.

It is an arithmetic number, because the mean of its divisors is an integer number (96412536).

Almost surely, 2^382728421 is an apocalyptic number.

It is an amenable number.

382728421 is a deficient number, since it is larger than the sum of its proper divisors (2921723).

382728421 is a wasteful number, since it uses less digits than its factorization.

382728421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2921722.

The product of its digits is 43008, while the sum is 37.

The square root of 382728421 is about 19563.4460410225. The cubic root of 382728421 is about 726.0450539574.

The spelling of 382728421 in words is "three hundred eighty-two million, seven hundred twenty-eight thousand, four hundred twenty-one".