1389636897 has 8 divisors (see below), whose sum is σ = 2021290080. Its totient is φ = 842204160.

The previous prime is 1389636889. The next prime is 1389636923. The reversal of 1389636897 is 7986369831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1389636897 - 2³ = 1389636889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1389636897.

It is not an unprimeable number, because it can be changed into a prime (1389636847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21055072 + ... + 21055137.

It is an arithmetic number, because the mean of its divisors is an integer number (252661260).

Almost surely, 2^1389636897 is an apocalyptic number.

It is an amenable number.

1389636897 is a deficient number, since it is larger than the sum of its proper divisors (631653183).

1389636897 is a wasteful number, since it uses less digits than its factorization.

1389636897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42110223.

The product of its digits is 11757312, while the sum is 60.

The square root of 1389636897 is about 37277.8338560598. The cubic root of 1389636897 is about 1115.9218440340.

The spelling of 1389636897 in words is "one billion, three hundred eighty-nine million, six hundred thirty-six thousand, eight hundred ninety-seven".