1399021963 has 2 divisors, whose sum is σ = 1399021964. Its totient is φ = 1399021962.

The previous prime is 1399021957. The next prime is 1399021999. The reversal of 1399021963 is 3691209931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1399021963 - 2²⁵ = 1365467531 is a prime.

It is not a weakly prime, because it can be changed into another prime (1399021903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699510981 + 699510982.

It is an arithmetic number, because the mean of its divisors is an integer number (699510982).

Almost surely, 2^1399021963 is an apocalyptic number.

1399021963 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399021963 is an equidigital number, since it uses as much as digits as its factorization.

1399021963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 1399021963 is about 37403.5020151857. The cubic root of 1399021963 is about 1118.4283768293.

It can be divided in two parts, 13990 and 21963, that added together give a palindrome (35953).

The spelling of 1399021963 in words is "one billion, three hundred ninety-nine million, twenty-one thousand, nine hundred sixty-three".