1389561321 has 8 divisors (see below), whose sum is σ = 1869746560. Its totient is φ = 917875152.

The previous prime is 1389561319. The next prime is 1389561337. The reversal of 1389561321 is 1231659831.

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

It is not a de Polignac number, because 1389561321 - 2¹ = 1389561319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1389561321.

It is not an unprimeable number, because it can be changed into a prime (1389561821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2124385 + ... + 2125038.

It is an arithmetic number, because the mean of its divisors is an integer number (233718320).

Almost surely, 2^1389561321 is an apocalyptic number.

It is an amenable number.

1389561321 is a deficient number, since it is larger than the sum of its proper divisors (480185239).

1389561321 is a wasteful number, since it uses less digits than its factorization.

1389561321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4249535.

The product of its digits is 38880, while the sum is 39.

The square root of 1389561321 is about 37276.8201567677. The cubic root of 1389561321 is about 1115.9016137042.

The spelling of 1389561321 in words is "one billion, three hundred eighty-nine million, five hundred sixty-one thousand, three hundred twenty-one".