1679999943 has 4 divisors (see below), whose sum is σ = 2239999928. Its totient is φ = 1119999960.

The previous prime is 1679999917. The next prime is 1679999947. The reversal of 1679999943 is 3499999761.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1679999943 - 2¹⁰ = 1679998919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1679999947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279999988 + ... + 279999993.

It is an arithmetic number, because the mean of its divisors is an integer number (559999982).

Almost surely, 2^1679999943 is an apocalyptic number.

1679999943 is a deficient number, since it is larger than the sum of its proper divisors (559999985).

1679999943 is an equidigital number, since it uses as much as digits as its factorization.

1679999943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559999984.

The product of its digits is 29760696, while the sum is 66.

The square root of 1679999943 is about 40987.8023685096. The cubic root of 1679999943 is about 1188.7843771080.

The spelling of 1679999943 in words is "one billion, six hundred seventy-nine million, nine hundred ninety-nine thousand, nine hundred forty-three".