389393665 has 8 divisors (see below), whose sum is σ = 467619048. Its totient is φ = 311283840.

The previous prime is 389393629. The next prime is 389393677. The reversal of 389393665 is 566393983.

It can be written as a sum of positive squares in 4 ways, for example, as 19254544 + 370139121 = 4388^2 + 19239^2 .

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

It is not a de Polignac number, because 389393665 - 2¹⁵ = 389360897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21292 + ... + 35101.

It is an arithmetic number, because the mean of its divisors is an integer number (58452381).

Almost surely, 2^389393665 is an apocalyptic number.

It is an amenable number.

389393665 is a deficient number, since it is larger than the sum of its proper divisors (78225383).

389393665 is a wasteful number, since it uses less digits than its factorization.

389393665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57779.

The product of its digits is 3149280, while the sum is 52.

The square root of 389393665 is about 19733.0602036278. The cubic root of 389393665 is about 730.2355310546.

The spelling of 389393665 in words is "three hundred eighty-nine million, three hundred ninety-three thousand, six hundred sixty-five".