384721 has 8 divisors (see below), whose sum is σ = 411840. Its totient is φ = 358512.

The previous prime is 384719. The next prime is 384733. The reversal of 384721 is 127483.

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 384721 - 2¹ = 384719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (384701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 795 + ... + 1183.

It is an arithmetic number, because the mean of its divisors is an integer number (51480).

2³⁸⁴⁷²¹ is an apocalyptic number.

It is an amenable number.

384721 is a deficient number, since it is larger than the sum of its proper divisors (27119).

384721 is a wasteful number, since it uses less digits than its factorization.

384721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455.

The product of its digits is 1344, while the sum is 25.

The square root of 384721 is about 620.2588169466. The cubic root of 384721 is about 72.7302863808.

The spelling of 384721 in words is "three hundred eighty-four thousand, seven hundred twenty-one".