1989079 has 4 divisors (see below), whose sum is σ = 1993176. Its totient is φ = 1984984.

The previous prime is 1989077. The next prime is 1989101. The reversal of 1989079 is 9709891.

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 1989079 - 2¹ = 1989077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989073) 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, 1204 + ... + 2329.

It is an arithmetic number, because the mean of its divisors is an integer number (498294).

2^1989079 is an apocalyptic number.

1989079 is a deficient number, since it is larger than the sum of its proper divisors (4097).

1989079 is an equidigital number, since it uses as much as digits as its factorization.

1989079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4096.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 1989079 is about 1410.3471203927. The cubic root of 1989079 is about 125.7623596761.

It can be divided in two parts, 198907 and 9, that added together give a square (198916 = 446²).

The spelling of 1989079 in words is "one million, nine hundred eighty-nine thousand, seventy-nine".