1389396428 has 48 divisors (see below), whose sum is σ = 2860220160. Its totient is φ = 578253504.

The previous prime is 1389396427. The next prime is 1389396439. The reversal of 1389396428 is 8246939831.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1389396428.

It is not an unprimeable number, because it can be changed into a prime (1389396427) 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, 132050 + ... + 142182.

It is an arithmetic number, because the mean of its divisors is an integer number (59587920).

Almost surely, 2^1389396428 is an apocalyptic number.

It is an amenable number.

1389396428 is an abundant number, since it is smaller than the sum of its proper divisors (1470823732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1389396428 is a wasteful number, since it uses less digits than its factorization.

1389396428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10286 (or 10284 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 53.

The square root of 1389396428 is about 37274.6083547500. The cubic root of 1389396428 is about 1115.8574722809.

The spelling of 1389396428 in words is "one billion, three hundred eighty-nine million, three hundred ninety-six thousand, four hundred twenty-eight".