1989800797 has 8 divisors (see below), whose sum is σ = 1998372096. Its totient is φ = 1981242192.

The previous prime is 1989800767. The next prime is 1989800831. The reversal of 1989800797 is 7970089891.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1989800797 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 (1989800737) 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, 433408 + ... + 437974.

It is an arithmetic number, because the mean of its divisors is an integer number (249796512).

Almost surely, 2^1989800797 is an apocalyptic number.

It is an amenable number.

1989800797 is a deficient number, since it is larger than the sum of its proper divisors (8571299).

1989800797 is a wasteful number, since it uses less digits than its factorization.

1989800797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6347.

The product of its (nonzero) digits is 2286144, while the sum is 58.

The square root of 1989800797 is about 44607.1832444058. The cubic root of 1989800797 is about 1257.7757005173.

The spelling of 1989800797 in words is "one billion, nine hundred eighty-nine million, eight hundred thousand, seven hundred ninety-seven".