1989666969 has 8 divisors (see below), whose sum is σ = 2658934080. Its totient is φ = 1323422256.

The previous prime is 1989666937. The next prime is 1989666977. The reversal of 1989666969 is 9696669891.

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

It is not a de Polignac number, because 1989666969 - 2⁵ = 1989666937 is a prime.

It is a super-2 number, since 2×1989666969² = 7917549295059293922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1989666169) 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, 754062 + ... + 756695.

It is an arithmetic number, because the mean of its divisors is an integer number (332366760).

Almost surely, 2^1989666969 is an apocalyptic number.

It is an amenable number.

1989666969 is a deficient number, since it is larger than the sum of its proper divisors (669267111).

1989666969 is a wasteful number, since it uses less digits than its factorization.

1989666969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511199.

The product of its digits is 68024448, while the sum is 69.

The square root of 1989666969 is about 44605.6831468816. The cubic root of 1989666969 is about 1257.7475018185.

The spelling of 1989666969 in words is "one billion, nine hundred eighty-nine million, six hundred sixty-six thousand, nine hundred sixty-nine".