99999409 has 4 divisors (see below), whose sum is σ = 102127104. Its totient is φ = 97871716.

The previous prime is 99999401. The next prime is 99999437. The reversal of 99999409 is 90499999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90499999 = 1429 ⋅63331.

It is a cyclic number.

It is not a de Polignac number, because 99999409 - 2³ = 99999401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99999401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063777 + ... + 1063870.

It is an arithmetic number, because the mean of its divisors is an integer number (25531776).

Almost surely, 2^99999409 is an apocalyptic number.

It is an amenable number.

99999409 is a deficient number, since it is larger than the sum of its proper divisors (2127695).

99999409 is a wasteful number, since it uses less digits than its factorization.

99999409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127694.

The product of its (nonzero) digits is 2125764, while the sum is 58.

The square root of 99999409 is about 9999.9704499563. The cubic root of 99999409 is about 464.1579689665.

The spelling of 99999409 in words is "ninety-nine million, nine hundred ninety-nine thousand, four hundred nine".