499889921 has 4 divisors (see below), whose sum is σ = 511515312. Its totient is φ = 488264532.

The previous prime is 499889903. The next prime is 499889933. The reversal of 499889921 is 129988994.

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 499889921 - 2²⁶ = 432781057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (499889941) 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, 5812631 + ... + 5812716.

It is an arithmetic number, because the mean of its divisors is an integer number (127878828).

Almost surely, 2^499889921 is an apocalyptic number.

It is an amenable number.

499889921 is a deficient number, since it is larger than the sum of its proper divisors (11625391).

499889921 is a wasteful number, since it uses less digits than its factorization.

499889921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11625390.

The product of its digits is 3359232, while the sum is 59.

The square root of 499889921 is about 22358.2181982375. The cubic root of 499889921 is about 793.6422752023.

The spelling of 499889921 in words is "four hundred ninety-nine million, eight hundred eighty-nine thousand, nine hundred twenty-one".