1389326992 has 10 divisors (see below), whose sum is σ = 2691821078. Its totient is φ = 694663488.

The previous prime is 1389326959. The next prime is 1389326993. The reversal of 1389326992 is 2996239831.

It can be written as a sum of positive squares in only one way, i.e., 1254859776 + 134467216 = 35424^2 + 11596^2 .

It is not an unprimeable number, because it can be changed into a prime (1389326993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43416453 + ... + 43416484.

Almost surely, 2^1389326992 is an apocalyptic number.

It is an amenable number.

1389326992 is a deficient number, since it is larger than the sum of its proper divisors (1302494086).

1389326992 is an equidigital number, since it uses as much as digits as its factorization.

1389326992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86832945 (or 86832939 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 52.

The square root of 1389326992 is about 37273.6769315827. The cubic root of 1389326992 is about 1115.8388834009.

It can be divided in two parts, 138932 and 6992, that added together give a square (145924 = 382²).

The spelling of 1389326992 in words is "one billion, three hundred eighty-nine million, three hundred twenty-six thousand, nine hundred ninety-two".