1389944089 has 4 divisors (see below), whose sum is σ = 1471705524. Its totient is φ = 1308182656.

The previous prime is 1389944081. The next prime is 1389944099. The reversal of 1389944089 is 9804499831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 591316489 + 798627600 = 24317^2 + 28260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389944089 - 2³ = 1389944081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389944081) 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, 40880692 + ... + 40880725.

It is an arithmetic number, because the mean of its divisors is an integer number (367926381).

Almost surely, 2^1389944089 is an apocalyptic number.

It is an amenable number.

1389944089 is a deficient number, since it is larger than the sum of its proper divisors (81761435).

1389944089 is an equidigital number, since it uses as much as digits as its factorization.

1389944089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81761434.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The square root of 1389944089 is about 37281.9539321640. The cubic root of 1389944089 is about 1116.0040662335.

The spelling of 1389944089 in words is "one billion, three hundred eighty-nine million, nine hundred forty-four thousand, eighty-nine".