99989440 has 56 divisors (see below), whose sum is σ = 239481360. Its totient is φ = 39763968.

The previous prime is 99989423. The next prime is 99989459. The reversal of 99989440 is 4498999.

It is a super-2 number, since 2×99989440² = 19995776223027200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60951 + ... + 62569.

Almost surely, 2^99989440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99989440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119740680).

99989440 is an abundant number, since it is smaller than the sum of its proper divisors (139491920).

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

99989440 is a wasteful number, since it uses less digits than its factorization.

99989440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829 (or 1819 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 99989440 is about 9999.4719860601. The cubic root of 99989440 is about 464.1425443934.

The spelling of 99989440 in words is "ninety-nine million, nine hundred eighty-nine thousand, four hundred forty".