389491405 has 8 divisors (see below), whose sum is σ = 475052184. Its totient is φ = 306484800.

The previous prime is 389491387. The next prime is 389491423. The reversal of 389491405 is 504194983.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (389491387) and next prime (389491423).

It can be written as a sum of positive squares in 4 ways, for example, as 59814756 + 329676649 = 7734^2 + 18157^2 .

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

It is not a de Polignac number, because 389491405 - 2¹¹ = 389489357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 638206 + ... + 638815.

It is an arithmetic number, because the mean of its divisors is an integer number (59381523).

Almost surely, 2^389491405 is an apocalyptic number.

It is an amenable number.

389491405 is a deficient number, since it is larger than the sum of its proper divisors (85560779).

389491405 is a wasteful number, since it uses less digits than its factorization.

389491405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277087.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 389491405 is about 19735.5366027884. The cubic root of 389491405 is about 730.2966236851.

The spelling of 389491405 in words is "three hundred eighty-nine million, four hundred ninety-one thousand, four hundred five".