1916979 has 4 divisors (see below), whose sum is σ = 2555976. Its totient is φ = 1277984.

The previous prime is 1916977. The next prime is 1917001. The reversal of 1916979 is 9796191.

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

It is a cyclic number.

It is not a de Polignac number, because 1916979 - 2¹ = 1916977 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1916979.

It is not an unprimeable number, because it can be changed into a prime (1916977) 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, 319494 + ... + 319499.

It is an arithmetic number, because the mean of its divisors is an integer number (638994).

2^1916979 is an apocalyptic number.

1916979 is a deficient number, since it is larger than the sum of its proper divisors (638997).

1916979 is an equidigital number, since it uses as much as digits as its factorization.

1916979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638996.

The product of its digits is 30618, while the sum is 42.

The square root of 1916979 is about 1384.5501074356. The cubic root of 1916979 is about 124.2240788703.

The spelling of 1916979 in words is "one million, nine hundred sixteen thousand, nine hundred seventy-nine".