1989864694 has 8 divisors (see below), whose sum is σ = 2990044440. Its totient is φ = 993183216.

The previous prime is 1989864649. The next prime is 1989864697. The reversal of 1989864694 is 4964689891.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989864697) 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, 873144 + ... + 875419.

It is an arithmetic number, because the mean of its divisors is an integer number (373755555).

Almost surely, 2^1989864694 is an apocalyptic number.

1989864694 is a deficient number, since it is larger than the sum of its proper divisors (1000179746).

1989864694 is a wasteful number, since it uses less digits than its factorization.

1989864694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749134.

The product of its digits is 26873856, while the sum is 64.

The square root of 1989864694 is about 44607.8994573831. The cubic root of 1989864694 is about 1257.7891637132.

The spelling of 1989864694 in words is "one billion, nine hundred eighty-nine million, eight hundred sixty-four thousand, six hundred ninety-four".