1389309381 has 8 divisors (see below), whose sum is σ = 2058236160. Its totient is φ = 926206236.

The previous prime is 1389309373. The next prime is 1389309391. The reversal of 1389309381 is 1839039831.

It is a happy number.

It is not a de Polignac number, because 1389309381 - 2³ = 1389309373 is a prime.

It is a super-2 number, since 2×1389309381² = 3860361112269206322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389309301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25727925 + ... + 25727978.

It is an arithmetic number, because the mean of its divisors is an integer number (257279520).

Almost surely, 2^1389309381 is an apocalyptic number.

It is an amenable number.

1389309381 is a deficient number, since it is larger than the sum of its proper divisors (668926779).

1389309381 is an equidigital number, since it uses as much as digits as its factorization.

1389309381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51455912 (or 51455906 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 1389309381 is about 37273.4406917312. The cubic root of 1389309381 is about 1115.8341686189.

The spelling of 1389309381 in words is "one billion, three hundred eighty-nine million, three hundred nine thousand, three hundred eighty-one".