1989730079 has 8 divisors (see below), whose sum is σ = 2003158320. Its totient is φ = 1976317056.

The previous prime is 1989730073. The next prime is 1989730087. The reversal of 1989730079 is 9700379891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1989730079 - 2²⁰ = 1988681503 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 1989730079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989730073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394727 + ... + 399735.

It is an arithmetic number, because the mean of its divisors is an integer number (250394790).

Almost surely, 2^1989730079 is an apocalyptic number.

1989730079 is a deficient number, since it is larger than the sum of its proper divisors (13428241).

1989730079 is a wasteful number, since it uses less digits than its factorization.

1989730079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7609.

The product of its (nonzero) digits is 857304, while the sum is 53.

The square root of 1989730079 is about 44606.3905623398. The cubic root of 1989730079 is about 1257.7607997902.

The spelling of 1989730079 in words is "one billion, nine hundred eighty-nine million, seven hundred thirty thousand, seventy-nine".