1989642986 has 8 divisors (see below), whose sum is σ = 2993481984. Its totient is φ = 991815660.

The previous prime is 1989642973. The next prime is 1989643001. The reversal of 1989642986 is 6892469891.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1502090 + ... + 1503413.

It is an arithmetic number, because the mean of its divisors is an integer number (374185248).

Almost surely, 2^1989642986 is an apocalyptic number.

1989642986 is a deficient number, since it is larger than the sum of its proper divisors (1003838998).

1989642986 is a wasteful number, since it uses less digits than its factorization.

1989642986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3005836.

The product of its digits is 13436928, while the sum is 62.

The square root of 1989642986 is about 44605.4143126146. The cubic root of 1989642986 is about 1257.7424482626.

The spelling of 1989642986 in words is "one billion, nine hundred eighty-nine million, six hundred forty-two thousand, nine hundred eighty-six".