1389789664 has 12 divisors (see below), whose sum is σ = 2736148464. Its totient is φ = 694894816.

The previous prime is 1389789641. The next prime is 1389789677. The reversal of 1389789664 is 4669879831.

It is a super-2 number, since 2×1389789664² = 3863030620322465792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 21715432 + ... + 21715495.

It is an arithmetic number, because the mean of its divisors is an integer number (228012372).

Almost surely, 2^1389789664 is an apocalyptic number.

It is an amenable number.

1389789664 is a deficient number, since it is larger than the sum of its proper divisors (1346358800).

1389789664 is an equidigital number, since it uses as much as digits as its factorization.

1389789664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43430937 (or 43430929 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 61.

The square root of 1389789664 is about 37279.8828324339. The cubic root of 1389789664 is about 1115.9627347603.

The spelling of 1389789664 in words is "one billion, three hundred eighty-nine million, seven hundred eighty-nine thousand, six hundred sixty-four".