1989963859 has 16 divisors (see below), whose sum is σ = 2238294240. Its totient is φ = 1756926720.

The previous prime is 1989963839. The next prime is 1989963881. The reversal of 1989963859 is 9583699891.

It is a cyclic number.

It is not a de Polignac number, because 1989963859 - 2¹⁵ = 1989931091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1989963794 and 1989963803.

It is not an unprimeable number, because it can be changed into a prime (1989963839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6682 + ... + 63439.

It is an arithmetic number, because the mean of its divisors is an integer number (139893390).

Almost surely, 2^1989963859 is an apocalyptic number.

1989963859 is a deficient number, since it is larger than the sum of its proper divisors (248330381).

1989963859 is a wasteful number, since it uses less digits than its factorization.

1989963859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70230.

The product of its digits is 37791360, while the sum is 67.

The square root of 1989963859 is about 44609.0109619122. The cubic root of 1989963859 is about 1257.8100573600.

The spelling of 1989963859 in words is "one billion, nine hundred eighty-nine million, nine hundred sixty-three thousand, eight hundred fifty-nine".