1001398939 has 2 divisors, whose sum is σ = 1001398940. Its totient is φ = 1001398938.

The previous prime is 1001398877. The next prime is 1001398943. The reversal of 1001398939 is 9398931001.

1001398939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1001398939 - 2⁹ = 1001398427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001398895 and 1001398904.

It is not a weakly prime, because it can be changed into another prime (1001398999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500699469 + 500699470.

It is an arithmetic number, because the mean of its divisors is an integer number (500699470).

Almost surely, 2^1001398939 is an apocalyptic number.

1001398939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001398939 is an equidigital number, since it uses as much as digits as its factorization.

1001398939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 1001398939 is about 31644.8880389866. Note that the first 3 decimals coincide. The cubic root of 1001398939 is about 1000.4660957210.

The spelling of 1001398939 in words is "one billion, one million, three hundred ninety-eight thousand, nine hundred thirty-nine".