989890387 has 4 divisors (see below), whose sum is σ = 989960976. Its totient is φ = 989819800.

The previous prime is 989890351. The next prime is 989890397. The reversal of 989890387 is 783098989.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 989890387 - 2¹⁹ = 989366099 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989890337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6343 + ... + 44944.

It is an arithmetic number, because the mean of its divisors is an integer number (247490244).

Almost surely, 2^989890387 is an apocalyptic number.

989890387 is a deficient number, since it is larger than the sum of its proper divisors (70589).

989890387 is a wasteful number, since it uses less digits than its factorization.

989890387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70588.

The product of its (nonzero) digits is 7838208, while the sum is 61.

The square root of 989890387 is about 31462.5235319737. The cubic root of 989890387 is about 996.6187087558.

The spelling of 989890387 in words is "nine hundred eighty-nine million, eight hundred ninety thousand, three hundred eighty-seven".