1389581027 has 4 divisors (see below), whose sum is σ = 1390415280. Its totient is φ = 1388746776.

The previous prime is 1389580943. The next prime is 1389581047. The reversal of 1389581027 is 7201859831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7201859831 = 57149 ⋅126019.

It is a cyclic number.

It is not a de Polignac number, because 1389581027 - 2¹² = 1389576931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389581047) 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, 414623 + ... + 417960.

It is an arithmetic number, because the mean of its divisors is an integer number (347603820).

Almost surely, 2^1389581027 is an apocalyptic number.

1389581027 is a deficient number, since it is larger than the sum of its proper divisors (834253).

1389581027 is an equidigital number, since it uses as much as digits as its factorization.

1389581027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834252.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 1389581027 is about 37277.0844755863. The cubic root of 1389581027 is about 1115.9068887151.

The spelling of 1389581027 in words is "one billion, three hundred eighty-nine million, five hundred eighty-one thousand, twenty-seven".