1389935217 has 16 divisors (see below), whose sum is σ = 2023676928. Its totient is φ = 841571280.

The previous prime is 1389935159. The next prime is 1389935221. The reversal of 1389935217 is 7125399831.

It is not a de Polignac number, because 1389935217 - 2⁶ = 1389935153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1389935297) 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, 15268 + ... + 54890.

It is an arithmetic number, because the mean of its divisors is an integer number (126479808).

Almost surely, 2^1389935217 is an apocalyptic number.

It is an amenable number.

1389935217 is a deficient number, since it is larger than the sum of its proper divisors (633741711).

1389935217 is a wasteful number, since it uses less digits than its factorization.

1389935217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40700.

The product of its digits is 408240, while the sum is 48.

The square root of 1389935217 is about 37281.8349467941. The cubic root of 1389935217 is about 1116.0016917473.

The spelling of 1389935217 in words is "one billion, three hundred eighty-nine million, nine hundred thirty-five thousand, two hundred seventeen".