99404909 has 4 divisors (see below), whose sum is σ = 99435420. Its totient is φ = 99374400.

The previous prime is 99404887. The next prime is 99404917. The reversal of 99404909 is 90940499.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29214025 + 70190884 = 5405^2 + 8378^2 .

It is a cyclic number.

It is not a de Polignac number, because 99404909 - 2⁸ = 99404653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99404909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99404939) 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, 9692 + ... + 17109.

It is an arithmetic number, because the mean of its divisors is an integer number (24858855).

Almost surely, 2^99404909 is an apocalyptic number.

It is an amenable number.

99404909 is a deficient number, since it is larger than the sum of its proper divisors (30511).

99404909 is a wasteful number, since it uses less digits than its factorization.

99404909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30510.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 99404909 is about 9970.2010511323. The cubic root of 99404909 is about 463.2363283398.

It can be divided in two parts, 9940490 and 9, that added together give a palindrome (9940499).

The spelling of 99404909 in words is "ninety-nine million, four hundred four thousand, nine hundred nine".