1979789 has 4 divisors (see below), whose sum is σ = 2262624. Its totient is φ = 1696956.

The previous prime is 1979779. The next prime is 1979807. The reversal of 1979789 is 9879791.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9879791 = 19 ⋅519989.

It is a cyclic number.

It is not a de Polignac number, because 1979789 - 2⁴ = 1979773 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979729) 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, 141407 + ... + 141420.

It is an arithmetic number, because the mean of its divisors is an integer number (565656).

2^1979789 is an apocalyptic number.

It is an amenable number.

1979789 is a deficient number, since it is larger than the sum of its proper divisors (282835).

1979789 is an equidigital number, since it uses as much as digits as its factorization.

1979789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282834.

The product of its digits is 285768, while the sum is 50.

The square root of 1979789 is about 1407.0497503642. The cubic root of 1979789 is about 125.5662628971.

The spelling of 1979789 in words is "one million, nine hundred seventy-nine thousand, seven hundred eighty-nine".