989454639 has 8 divisors (see below), whose sum is σ = 1349953792. Its totient is φ = 644295960.

The previous prime is 989454623. The next prime is 989454649. The reversal of 989454639 is 936454989.

It is a happy number.

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

It is not a de Polignac number, because 989454639 - 2⁴ = 989454623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989454649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3834967 + ... + 3835224.

It is an arithmetic number, because the mean of its divisors is an integer number (168744224).

Almost surely, 2^989454639 is an apocalyptic number.

989454639 is a deficient number, since it is larger than the sum of its proper divisors (360499153).

989454639 is a wasteful number, since it uses less digits than its factorization.

989454639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7670237.

The product of its digits is 8398080, while the sum is 57.

The square root of 989454639 is about 31455.5978960820. The cubic root of 989454639 is about 996.4724506944.

The spelling of 989454639 in words is "nine hundred eighty-nine million, four hundred fifty-four thousand, six hundred thirty-nine".