1389308973 has 16 divisors (see below), whose sum is σ = 2041300800. Its totient is φ = 835075584.

The previous prime is 1389308959. The next prime is 1389309001. The reversal of 1389308973 is 3798039831.

It is a happy number.

It is not a de Polignac number, because 1389308973 - 2⁵ = 1389308941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389308933) 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, 412548 + ... + 415901.

It is an arithmetic number, because the mean of its divisors is an integer number (127581300).

Almost surely, 2^1389308973 is an apocalyptic number.

1389308973 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1389308973 is a deficient number, since it is larger than the sum of its proper divisors (651991827).

1389308973 is a wasteful number, since it uses less digits than its factorization.

1389308973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828508.

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 1389308973 is about 37273.4352186648. The cubic root of 1389308973 is about 1115.8340593895.

The spelling of 1389308973 in words is "one billion, three hundred eighty-nine million, three hundred eight thousand, nine hundred seventy-three".