99440 has 40 divisors (see below), whose sum is σ = 254448. Its totient is φ = 35840.

The previous prime is 99439. The next prime is 99469. The reversal of 99440 is 4499.

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 10.

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, 824 + ... + 936.

2⁹⁹⁴⁴⁰ 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 99440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127224).

99440 is an abundant number, since it is smaller than the sum of its proper divisors (155008).

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

99440 is a wasteful number, since it uses less digits than its factorization.

99440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 99440 is about 315.3410851760. The cubic root of 99440 is about 46.3290831059.

It can be divided in two parts, 9 and 9440, that added together give a palindrome (9449).

The spelling of 99440 in words is "ninety-nine thousand, four hundred forty".