1389006385 has 8 divisors (see below), whose sum is σ = 1795023720. Its totient is φ = 1025727744.

The previous prime is 1389006347. The next prime is 1389006391. The reversal of 1389006385 is 5836009831.

It can be written as a sum of positive squares in 4 ways, for example, as 400689 + 1388605696 = 633^2 + 37264^2 .

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 1389006385 - 2¹⁵ = 1388973617 is a prime.

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, 10684600 + ... + 10684729.

It is an arithmetic number, because the mean of its divisors is an integer number (224377965).

Almost surely, 2^1389006385 is an apocalyptic number.

It is an amenable number.

1389006385 is a deficient number, since it is larger than the sum of its proper divisors (406017335).

1389006385 is a wasteful number, since it uses less digits than its factorization.

1389006385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21369347.

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

The square root of 1389006385 is about 37269.3759674079. The cubic root of 1389006385 is about 1115.7530448904.

The spelling of 1389006385 in words is "one billion, three hundred eighty-nine million, six thousand, three hundred eighty-five".