989401986 has 64 divisors (see below), whose sum is σ = 2247834240. Its totient is φ = 322470720.

The previous prime is 989401967. The next prime is 989401993. The reversal of 989401986 is 689104989.

989401986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1496496 + ... + 1497156.

It is an arithmetic number, because the mean of its divisors is an integer number (35122410).

Almost surely, 2^989401986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989401986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1123917120).

989401986 is an abundant number, since it is smaller than the sum of its proper divisors (1258432254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

989401986 is a wasteful number, since it uses less digits than its factorization.

989401986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248 (or 1242 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 989401986 is about 31454.7609432976. The cubic root of 989401986 is about 996.4547748985.

The spelling of 989401986 in words is "nine hundred eighty-nine million, four hundred one thousand, nine hundred eighty-six".