1399999943 has 2 divisors, whose sum is σ = 1399999944. Its totient is φ = 1399999942.

The previous prime is 1399999883. The next prime is 1399999957. The reversal of 1399999943 is 3499999931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1399999943 - 2⁸ = 1399999687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1399999943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1399999543) 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, 699999971 + 699999972.

It is an arithmetic number, because the mean of its divisors is an integer number (699999972).

Almost surely, 2^1399999943 is an apocalyptic number.

1399999943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399999943 is an equidigital number, since it uses as much as digits as its factorization.

1399999943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19131876, while the sum is 65.

The square root of 1399999943 is about 37416.5731060449. The cubic root of 1399999943 is about 1118.6889268992.

The spelling of 1399999943 in words is "one billion, three hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty-three".