99040321 has 4 divisors (see below), whose sum is σ = 99484672. Its totient is φ = 98595972.

The previous prime is 99040313. The next prime is 99040363. The reversal of 99040321 is 12304099.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 99040321 - 2³ = 99040313 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 99040321.

It is not an unprimeable number, because it can be changed into a prime (99040391) 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, 221841 + ... + 222286.

It is an arithmetic number, because the mean of its divisors is an integer number (24871168).

Almost surely, 2^99040321 is an apocalyptic number.

It is an amenable number.

99040321 is a deficient number, since it is larger than the sum of its proper divisors (444351).

99040321 is a wasteful number, since it uses less digits than its factorization.

99040321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444350.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 99040321 is about 9951.9003712859. The cubic root of 99040321 is about 462.6692962886.

The spelling of 99040321 in words is "ninety-nine million, forty thousand, three hundred twenty-one".