1679390121 has 4 divisors (see below), whose sum is σ = 2239186832. Its totient is φ = 1119593412.

The previous prime is 1679390099. The next prime is 1679390123. The reversal of 1679390121 is 1210939761.

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 not a de Polignac number, because 1679390121 - 2¹³ = 1679381929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1679390121.

It is not an unprimeable number, because it can be changed into a prime (1679390123) 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, 279898351 + ... + 279898356.

It is an arithmetic number, because the mean of its divisors is an integer number (559796708).

Almost surely, 2^1679390121 is an apocalyptic number.

It is an amenable number.

1679390121 is a deficient number, since it is larger than the sum of its proper divisors (559796711).

1679390121 is an equidigital number, since it uses as much as digits as its factorization.

1679390121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559796710.

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 1679390121 is about 40980.3626265069. The cubic root of 1679390121 is about 1188.6405210317.

The spelling of 1679390121 in words is "one billion, six hundred seventy-nine million, three hundred ninety thousand, one hundred twenty-one".