99531940 has 48 divisors (see below), whose sum is σ = 224042112. Its totient is φ = 37008896.

The previous prime is 99531919. The next prime is 99531941. The reversal of 99531940 is 4913599.

It is a junction number, because it is equal to n+sod(n) for n = 99531893 and 99531902.

It is not an unprimeable number, because it can be changed into a prime (99531941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26457 + ... + 29983.

It is an arithmetic number, because the mean of its divisors is an integer number (4667544).

Almost surely, 2^99531940 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 99531940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112021056).

99531940 is an abundant number, since it is smaller than the sum of its proper divisors (124510172).

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

99531940 is a wasteful number, since it uses less digits than its factorization.

99531940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3636 (or 3634 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 99531940 is about 9976.5695507023. The cubic root of 99531940 is about 463.4335698575.

The spelling of 99531940 in words is "ninety-nine million, five hundred thirty-one thousand, nine hundred forty".