999906249 has 4 divisors (see below), whose sum is σ = 1333208336. Its totient is φ = 666604164.

The previous prime is 999906227. The next prime is 999906251. The reversal of 999906249 is 942609999.

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 not a de Polignac number, because 999906249 - 2⁷ = 999906121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999906949) 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, 166651039 + ... + 166651044.

It is an arithmetic number, because the mean of its divisors is an integer number (333302084).

Almost surely, 2^999906249 is an apocalyptic number.

It is an amenable number.

999906249 is a deficient number, since it is larger than the sum of its proper divisors (333302087).

999906249 is a wasteful number, since it uses less digits than its factorization.

999906249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333302086.

The product of its (nonzero) digits is 2834352, while the sum is 57.

The square root of 999906249 is about 31621.2942334750. The cubic root of 999906249 is about 999.9687486900.

The spelling of 999906249 in words is "nine hundred ninety-nine million, nine hundred six thousand, two hundred forty-nine".