120639389 has 4 divisors (see below), whose sum is σ = 129919356. Its totient is φ = 111359424.

The previous prime is 120639373. The next prime is 120639401. The reversal of 120639389 is 983936021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 983936021 = 23 ⋅42779827.

It can be written as a sum of positive squares in 2 ways, for example, as 25908100 + 94731289 = 5090^2 + 9733^2 .

It is a cyclic number.

It is not a de Polignac number, because 120639389 - 2⁴ = 120639373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120639319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4639964 + ... + 4639989.

It is an arithmetic number, because the mean of its divisors is an integer number (32479839).

Almost surely, 2^120639389 is an apocalyptic number.

It is an amenable number.

120639389 is a deficient number, since it is larger than the sum of its proper divisors (9279967).

120639389 is an equidigital number, since it uses as much as digits as its factorization.

120639389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9279966.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 120639389 is about 10983.5963600271. The cubic root of 120639389 is about 494.1169018032.

The spelling of 120639389 in words is "one hundred twenty million, six hundred thirty-nine thousand, three hundred eighty-nine".