384938661 has 4 divisors (see below), whose sum is σ = 513251552. Its totient is φ = 256625772.

The previous prime is 384938647. The next prime is 384938699. The reversal of 384938661 is 166839483.

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, and also an emirpimes, since its reverse is a distinct semiprime: 166839483 = 3 ⋅55613161.

It is not a de Polignac number, because 384938661 - 2²⁶ = 317829797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 384938661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384948661) 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, 64156441 + ... + 64156446.

It is an arithmetic number, because the mean of its divisors is an integer number (128312888).

Almost surely, 2^384938661 is an apocalyptic number.

It is an amenable number.

384938661 is a deficient number, since it is larger than the sum of its proper divisors (128312891).

384938661 is a wasteful number, since it uses less digits than its factorization.

384938661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128312890.

The product of its digits is 746496, while the sum is 48.

The square root of 384938661 is about 19619.8537456323. The cubic root of 384938661 is about 727.4399983579.

The spelling of 384938661 in words is "three hundred eighty-four million, nine hundred thirty-eight thousand, six hundred sixty-one".