1398759979 has 2 divisors, whose sum is σ = 1398759980. Its totient is φ = 1398759978.

The previous prime is 1398759953. The next prime is 1398760001. The reversal of 1398759979 is 9799578931.

It is a strong prime.

It is an emirp because it is prime and its reverse (9799578931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1398759979 - 2¹⁹ = 1398235691 is a prime.

It is not a weakly prime, because it can be changed into another prime (1398759679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699379989 + 699379990.

It is an arithmetic number, because the mean of its divisors is an integer number (699379990).

Almost surely, 2^1398759979 is an apocalyptic number.

1398759979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398759979 is an equidigital number, since it uses as much as digits as its factorization.

1398759979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38578680, while the sum is 67.

The square root of 1398759979 is about 37399.9997192513. Note that the first 3 decimals coincide. The cubic root of 1398759979 is about 1118.3585593331.

The spelling of 1398759979 in words is "one billion, three hundred ninety-eight million, seven hundred fifty-nine thousand, nine hundred seventy-nine".