1989666970 has 8 divisors (see below), whose sum is σ = 3581400564. Its totient is φ = 795866784.

The previous prime is 1989666937. The next prime is 1989666977. The reversal of 1989666970 is 796669891.

It can be written as a sum of positive squares in 2 ways, for example, as 1869611121 + 120055849 = 43239^2 + 10957^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1989666899 and 1989666908.

It is not an unprimeable number, because it can be changed into a prime (1989666977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99483339 + ... + 99483358.

Almost surely, 2^1989666970 is an apocalyptic number.

1989666970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1989666970 is a deficient number, since it is larger than the sum of its proper divisors (1591733594).

1989666970 is a wasteful number, since it uses less digits than its factorization.

1989666970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198966704.

The product of its (nonzero) digits is 8817984, while the sum is 61.

The square root of 1989666970 is about 44605.6831580910. The cubic root of 1989666970 is about 1257.7475020292.

The spelling of 1989666970 in words is "one billion, nine hundred eighty-nine million, six hundred sixty-six thousand, nine hundred seventy".