99999958 has 16 divisors (see below), whose sum is σ = 151398720.
Its totient is φ = 49536256.
The previous prime is 99999941. The next prime is 99999959. The reversal of 99999958 is 85999999.
It is a junction number, because it is equal to n+sod(n) for n = 99999893 and 99999902.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (99999959) 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, 138723 + ... + 139441.
It is an arithmetic number, because the mean of its divisors is an integer number (9462420).
Almost surely, 299999958 is an apocalyptic number.
99999958 is a deficient number, since it is larger than the sum of its proper divisors (51398762).
99999958 is a wasteful number, since it uses less digits than its factorization.
99999958 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1271.
The product of its digits is 21257640, while the sum is 67.
The square root of 99999958 is about 9999.9978999998.
The cubic root of 99999958 is about 464.1588183790.
The spelling of 99999958 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-eight".