99398640 has 160 divisors (see below), whose sum is σ = 350977536. Its totient is φ = 23034880.

The previous prime is 99398627. The next prime is 99398641. The reversal of 99398640 is 4689399.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 99398640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99398641) 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, 59902 + ... + 61538.

Almost surely, 2^99398640 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 99398640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175488768).

99398640 is an abundant number, since it is smaller than the sum of its proper divisors (251578896).

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

99398640 is a wasteful number, since it uses less digits than its factorization.

99398640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687 (or 1681 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 99398640 is about 9969.8866593357. The cubic root of 99398640 is about 463.2265900897.

The spelling of 99398640 in words is "ninety-nine million, three hundred ninety-eight thousand, six hundred forty".