99915930 has 80 divisors (see below), whose sum is σ = 270220104. Its totient is φ = 26490240.

The previous prime is 99915929. The next prime is 99915931. The reversal of 99915930 is 3951999.

It is an interprime number because it is at equal distance from previous prime (99915929) and next prime (99915931).

It can be written as a sum of positive squares in 4 ways, for example, as 72948681 + 26967249 = 8541^2 + 5193^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99915931) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 237120 + ... + 237540.

Almost surely, 2^99915930 is an apocalyptic number.

99915930 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 99915930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135110052).

99915930 is an abundant number, since it is smaller than the sum of its proper divisors (170304174).

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

99915930 is a wasteful number, since it uses less digits than its factorization.

99915930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733 (or 724 counting only the distinct ones).

The product of its (nonzero) digits is 98415, while the sum is 45.

The square root of 99915930 is about 9995.7956161578. The cubic root of 99915930 is about 464.0287741024.

The spelling of 99915930 in words is "ninety-nine million, nine hundred fifteen thousand, nine hundred thirty".