1389728315 has 8 divisors (see below), whose sum is σ = 1667897568. Its totient is φ = 1111633600.

The previous prime is 1389728311. The next prime is 1389728339. The reversal of 1389728315 is 5138279831.

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

It is not a de Polignac number, because 1389728315 - 2² = 1389728311 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 1389728315.

It is not an unprimeable number, because it can be changed into a prime (1389728311) 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, 38090 + ... + 65040.

It is an arithmetic number, because the mean of its divisors is an integer number (208487196).

Almost surely, 2^1389728315 is an apocalyptic number.

1389728315 is a deficient number, since it is larger than the sum of its proper divisors (278169253).

1389728315 is a wasteful number, since it uses less digits than its factorization.

1389728315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37269.

The product of its digits is 362880, while the sum is 47.

The square root of 1389728315 is about 37279.0600069261. The cubic root of 1389728315 is about 1115.9463140008.

The spelling of 1389728315 in words is "one billion, three hundred eighty-nine million, seven hundred twenty-eight thousand, three hundred fifteen".