1389019705 has 4 divisors (see below), whose sum is σ = 1666823652. Its totient is φ = 1111215760.

The previous prime is 1389019673. The next prime is 1389019711. The reversal of 1389019705 is 5079109831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5079109831 = 73 ⋅69576847.

It can be written as a sum of positive squares in 2 ways, for example, as 402243136 + 986776569 = 20056^2 + 31413^2 .

It is not a de Polignac number, because 1389019705 - 2⁵ = 1389019673 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138901966 + ... + 138901975.

It is an arithmetic number, because the mean of its divisors is an integer number (416705913).

Almost surely, 2^1389019705 is an apocalyptic number.

It is an amenable number.

1389019705 is a deficient number, since it is larger than the sum of its proper divisors (277803947).

1389019705 is an equidigital number, since it uses as much as digits as its factorization.

1389019705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277803946.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 1389019705 is about 37269.5546659737. The cubic root of 1389019705 is about 1115.7566114166.

The spelling of 1389019705 in words is "one billion, three hundred eighty-nine million, nineteen thousand, seven hundred five".