499999921 has 8 divisors (see below), whose sum is σ = 522301824. Its totient is φ = 477744960.

The previous prime is 499999909. The next prime is 499999931. The reversal of 499999921 is 129999994.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 499999921 - 2¹³ = 499991729 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 499999921.

It is not an unprimeable number, because it can be changed into a prime (499999931) 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, 11001 + ... + 33481.

It is an arithmetic number, because the mean of its divisors is an integer number (65287728).

Almost surely, 2^499999921 is an apocalyptic number.

It is an amenable number.

499999921 is a deficient number, since it is larger than the sum of its proper divisors (22301903).

499999921 is a wasteful number, since it uses less digits than its factorization.

499999921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23471.

The product of its digits is 4251528, while the sum is 61.

The square root of 499999921 is about 22360.6780085041. The cubic root of 499999921 is about 793.7004841825.

The spelling of 499999921 in words is "four hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred twenty-one".