1679687993 has 4 divisors (see below), whose sum is σ = 1680292608. Its totient is φ = 1679083380.

The previous prime is 1679687983. The next prime is 1679688013. The reversal of 1679687993 is 3997869761.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1679687993 - 2¹⁸ = 1679425849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1679687963) 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, 298121 + ... + 303702.

It is an arithmetic number, because the mean of its divisors is an integer number (420073152).

Almost surely, 2^1679687993 is an apocalyptic number.

It is an amenable number.

1679687993 is a deficient number, since it is larger than the sum of its proper divisors (604615).

1679687993 is an equidigital number, since it uses as much as digits as its factorization.

1679687993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604614.

The product of its digits is 30862944, while the sum is 65.

The square root of 1679687993 is about 40983.9967914307. The cubic root of 1679687993 is about 1188.7107929305.

The spelling of 1679687993 in words is "one billion, six hundred seventy-nine million, six hundred eighty-seven thousand, nine hundred ninety-three".