389790649 has 8 divisors (see below), whose sum is σ = 402965640. Its totient is φ = 376790400.

The previous prime is 389790647. The next prime is 389790691. The reversal of 389790649 is 946097983.

It can be written as a sum of positive squares in 4 ways, for example, as 108993600 + 280797049 = 10440^2 + 16757^2 .

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 389790649 - 2¹ = 389790647 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 389790649.

It is not an unprimeable number, because it can be changed into a prime (389790647) 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, 39142 + ... + 48079.

It is an arithmetic number, because the mean of its divisors is an integer number (50370705).

Almost surely, 2^389790649 is an apocalyptic number.

It is an amenable number.

389790649 is a deficient number, since it is larger than the sum of its proper divisors (13174991).

389790649 is a wasteful number, since it uses less digits than its factorization.

389790649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87371.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 389790649 is about 19743.1164966426. The cubic root of 389790649 is about 730.4836033694.

The spelling of 389790649 in words is "three hundred eighty-nine million, seven hundred ninety thousand, six hundred forty-nine".