99439799040 has 504 divisors, whose sum is σ = 363182931888. Its totient is φ = 26067640320.

The previous prime is 99439799021. The next prime is 99439799047. The reversal of 99439799040 is 4099793499.

99439799040 is a `hidden beast` number, since 9 + 9 + 439 + 79 + 90 + 40 = 666.

It is a super-3 number, since 3×99439799040³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99439799047) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 56919447 + ... + 56921193.

Almost surely, 2^99439799040 is an apocalyptic number.

99439799040 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 99439799040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181591465944).

99439799040 is an abundant number, since it is smaller than the sum of its proper divisors (263743132848).

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

99439799040 is an equidigital number, since it uses as much as digits as its factorization.

99439799040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847 (or 1818 counting only the distinct ones).

The product of its (nonzero) digits is 19840464, while the sum is 63.

The spelling of 99439799040 in words is "ninety-nine billion, four hundred thirty-nine million, seven hundred ninety-nine thousand, forty".