1389326999 has 2 divisors, whose sum is σ = 1389327000. Its totient is φ = 1389326998.

The previous prime is 1389326993. The next prime is 1389327047. The reversal of 1389326999 is 9996239831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1389326999 - 2¹⁶ = 1389261463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1389326993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694663499 + 694663500.

It is an arithmetic number, because the mean of its divisors is an integer number (694663500).

Almost surely, 2^1389326999 is an apocalyptic number.

1389326999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389326999 is an equidigital number, since it uses as much as digits as its factorization.

1389326999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5668704, while the sum is 59.

The square root of 1389326999 is about 37273.6770254827. The cubic root of 1389326999 is about 1115.8388852749.

The spelling of 1389326999 in words is "one billion, three hundred eighty-nine million, three hundred twenty-six thousand, nine hundred ninety-nine".