99999940 has 24 divisors (see below), whose sum is σ = 214885440.
Its totient is φ = 39069408.
The previous prime is 99999931. The next prime is 99999941. The reversal of 99999940 is 4999999.
It is a nialpdrome in base 10.
It is not an unprimeable number, because it can be changed into a prime (99999941) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57280 + ... + 58999.
It is an arithmetic number, because the mean of its divisors is an integer number (8953560).
Almost surely, 299999940 is an apocalyptic number.
It is an amenable number.
99999940 is an abundant number, since it is smaller than the sum of its proper divisors (114885500).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
99999940 is a wasteful number, since it uses less digits than its factorization.
99999940 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 116331 (or 116329 counting only the distinct ones).
The product of its (nonzero) digits is 2125764, while the sum is 58.
The square root of 99999940 is about 9999.9969999995.
The cubic root of 99999940 is about 464.1587905295.
The spelling of 99999940 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty".