1389707709 has 16 divisors (see below), whose sum is σ = 2100504000. Its totient is φ = 810193536.

The previous prime is 1389707681. The next prime is 1389707719. The reversal of 1389707709 is 9077079831.

It is a happy number.

It is not a de Polignac number, because 1389707709 - 2⁸ = 1389707453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389707719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 936984 + ... + 938465.

It is an arithmetic number, because the mean of its divisors is an integer number (131281500).

Almost surely, 2^1389707709 is an apocalyptic number.

1389707709 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1389707709 is a deficient number, since it is larger than the sum of its proper divisors (710796291).

1389707709 is a wasteful number, since it uses less digits than its factorization.

1389707709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875484.

The product of its (nonzero) digits is 666792, while the sum is 51.

The square root of 1389707709 is about 37278.7836309073. The cubic root of 1389707709 is about 1115.9407984615.

The spelling of 1389707709 in words is "one billion, three hundred eighty-nine million, seven hundred seven thousand, seven hundred nine".