1389306428 has 6 divisors (see below), whose sum is σ = 2431286256. Its totient is φ = 694653212.

The previous prime is 1389306389. The next prime is 1389306433. The reversal of 1389306428 is 8246039831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173663300 + ... + 173663307.

It is an arithmetic number, because the mean of its divisors is an integer number (405214376).

Almost surely, 2^1389306428 is an apocalyptic number.

It is an amenable number.

1389306428 is a deficient number, since it is larger than the sum of its proper divisors (1041979828).

1389306428 is a wasteful number, since it uses less digits than its factorization.

1389306428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347326611 (or 347326609 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 1389306428 is about 37273.4010790537. The cubic root of 1389306428 is about 1115.8333780437.

The spelling of 1389306428 in words is "one billion, three hundred eighty-nine million, three hundred six thousand, four hundred twenty-eight".