384661 has 4 divisors (see below), whose sum is σ = 388300. Its totient is φ = 381024.

The previous prime is 384641. The next prime is 384673. The reversal of 384661 is 166483.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166483 = 229 ⋅727.

It can be written as a sum of positive squares in 2 ways, for example, as 140625 + 244036 = 375^2 + 494^2 .

It is a cyclic number.

It is not a de Polignac number, because 384661 - 2⁷ = 384533 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 (384611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1656 + ... + 1873.

It is an arithmetic number, because the mean of its divisors is an integer number (97075).

2³⁸⁴⁶⁶¹ is an apocalyptic number.

It is an amenable number.

384661 is a deficient number, since it is larger than the sum of its proper divisors (3639).

384661 is a wasteful number, since it uses less digits than its factorization.

384661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3638.

The product of its digits is 3456, while the sum is 28.

The square root of 384661 is about 620.2104481545. The cubic root of 384661 is about 72.7265052476.

The spelling of 384661 in words is "three hundred eighty-four thousand, six hundred sixty-one".