1989799305 has 16 divisors (see below), whose sum is σ = 3428577600. Its totient is φ = 979593408.

The previous prime is 1989799291. The next prime is 1989799327. The reversal of 1989799305 is 5039979891.

It is not a de Polignac number, because 1989799305 - 2⁶ = 1989799241 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5101855 + ... + 5102244.

It is an arithmetic number, because the mean of its divisors is an integer number (214286100).

Almost surely, 2^1989799305 is an apocalyptic number.

1989799305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1989799305 is a deficient number, since it is larger than the sum of its proper divisors (1438778295).

1989799305 is a wasteful number, since it uses less digits than its factorization.

1989799305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10204120.

The product of its (nonzero) digits is 5511240, while the sum is 60.

The square root of 1989799305 is about 44607.1665206388. The cubic root of 1989799305 is about 1257.7753861472.

The spelling of 1989799305 in words is "one billion, nine hundred eighty-nine million, seven hundred ninety-nine thousand, three hundred five".