1389660655 has 8 divisors (see below), whose sum is σ = 1676058912. Its totient is φ = 1106084448.

The previous prime is 1389660647. The next prime is 1389660661. The reversal of 1389660655 is 5560669831.

It is a happy number.

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 1389660655 - 2³ = 1389660647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1389660599 and 1389660608.

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, 704427 + ... + 706396.

It is an arithmetic number, because the mean of its divisors is an integer number (209507364).

Almost surely, 2^1389660655 is an apocalyptic number.

1389660655 is a deficient number, since it is larger than the sum of its proper divisors (286398257).

1389660655 is a wasteful number, since it uses less digits than its factorization.

1389660655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411025.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The square root of 1389660655 is about 37278.1525159174. The cubic root of 1389660655 is about 1115.9282034699.

The spelling of 1389660655 in words is "one billion, three hundred eighty-nine million, six hundred sixty thousand, six hundred fifty-five".