1989209811 has 8 divisors (see below), whose sum is σ = 2708711424. Its totient is φ = 1297924040.

The previous prime is 1989209759. The next prime is 1989209813. The reversal of 1989209811 is 1189029891.

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 1989209811 - 2¹¹ = 1989207763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1989209813) 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, 7053795 + ... + 7054076.

It is an arithmetic number, because the mean of its divisors is an integer number (338588928).

Almost surely, 2^1989209811 is an apocalyptic number.

1989209811 is a deficient number, since it is larger than the sum of its proper divisors (719501613).

1989209811 is a wasteful number, since it uses less digits than its factorization.

1989209811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14107921.

The product of its (nonzero) digits is 93312, while the sum is 48.

The square root of 1989209811 is about 44600.5584157867. The cubic root of 1989209811 is about 1257.6511651979.

The spelling of 1989209811 in words is "one billion, nine hundred eighty-nine million, two hundred nine thousand, eight hundred eleven".