1389355305 has 64 divisors (see below), whose sum is σ = 2450891520. Its totient is φ = 667892736.

The previous prime is 1389355283. The next prime is 1389355367. The reversal of 1389355305 is 5035539831.

1389355305 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1389355305 - 2⁸ = 1389355049 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2266179 + ... + 2266791.

It is an arithmetic number, because the mean of its divisors is an integer number (38295180).

Almost surely, 2^1389355305 is an apocalyptic number.

1389355305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1389355305 is a deficient number, since it is larger than the sum of its proper divisors (1061536215).

1389355305 is a wasteful number, since it uses less digits than its factorization.

1389355305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890.

The product of its (nonzero) digits is 243000, while the sum is 42.

The square root of 1389355305 is about 37274.0567285076. The cubic root of 1389355305 is about 1115.8464632176.

The spelling of 1389355305 in words is "one billion, three hundred eighty-nine million, three hundred fifty-five thousand, three hundred five".