8997989 has 32 divisors (see below), whose sum is σ = 12337920. Its totient is φ = 6336000.

The previous prime is 8997979. The next prime is 8998061. The reversal of 8997989 is 9897998.

It is not a de Polignac number, because 8997989 - 2⁴ = 8997973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8997979) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89039 + ... + 89139.

It is an arithmetic number, because the mean of its divisors is an integer number (385560).

Almost surely, 2^8997989 is an apocalyptic number.

8997989 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

8997989 is a deficient number, since it is larger than the sum of its proper divisors (3339931).

8997989 is a wasteful number, since it uses less digits than its factorization.

8997989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221.

The product of its digits is 2939328, while the sum is 59.

The square root of 8997989 is about 2999.6648146085. The cubic root of 8997989 is about 207.9928883786.

Subtracting 8997989 from its reverse (9897998), we obtain a palindrome (900009).

It can be divided in two parts, 899 and 7989, that added together give a palindrome (8888).

The spelling of 8997989 in words is "eight million, nine hundred ninety-seven thousand, nine hundred eighty-nine".