989896509 has 24 divisors (see below), whose sum is σ = 1635833472. Its totient is φ = 565060320.

The previous prime is 989896499. The next prime is 989896559. The reversal of 989896509 is 905698989.

It is not a de Polignac number, because 989896509 - 2⁴ = 989896493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989896559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56064 + ... + 71574.

It is an arithmetic number, because the mean of its divisors is an integer number (68159728).

Almost surely, 2^989896509 is an apocalyptic number.

It is an amenable number.

989896509 is a deficient number, since it is larger than the sum of its proper divisors (645936963).

989896509 is a wasteful number, since it uses less digits than its factorization.

989896509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16537 (or 16534 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 63.

The square root of 989896509 is about 31462.6208221756. The cubic root of 989896509 is about 996.6207632887.

The spelling of 989896509 in words is "nine hundred eighty-nine million, eight hundred ninety-six thousand, five hundred nine".