1679869321 has 4 divisors (see below), whose sum is σ = 1809090052. Its totient is φ = 1550648592.

The previous prime is 1679869319. The next prime is 1679869327. The reversal of 1679869321 is 1239689761.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 854743696 + 825125625 = 29236^2 + 28725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1679869321 - 2¹ = 1679869319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1679869327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64610346 + ... + 64610371.

It is an arithmetic number, because the mean of its divisors is an integer number (452272513).

Almost surely, 2^1679869321 is an apocalyptic number.

It is an amenable number.

1679869321 is a deficient number, since it is larger than the sum of its proper divisors (129220731).

1679869321 is a wasteful number, since it uses less digits than its factorization.

1679869321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129220730.

The product of its digits is 979776, while the sum is 52.

The square root of 1679869321 is about 40986.2089122671. The cubic root of 1679869321 is about 1188.7535665083.

The spelling of 1679869321 in words is "one billion, six hundred seventy-nine million, eight hundred sixty-nine thousand, three hundred twenty-one".