99001440 has 120 divisors (see below), whose sum is σ = 349438320. Its totient is φ = 26396928.

The previous prime is 99001439. The next prime is 99001451. The reversal of 99001440 is 4410099.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9141 + ... + 16779.

It is an arithmetic number, because the mean of its divisors is an integer number (2911986).

Almost surely, 2^99001440 is an apocalyptic number.

99001440 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99001440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174719160).

99001440 is an abundant number, since it is smaller than the sum of its proper divisors (250436880).

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

99001440 is a wasteful number, since it uses less digits than its factorization.

99001440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7666 (or 7649 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 99001440 is about 9949.9467335258. The cubic root of 99001440 is about 462.6087438480.

The spelling of 99001440 in words is "ninety-nine million, one thousand, four hundred forty".