909939 has 4 divisors (see below), whose sum is σ = 1213256. Its totient is φ = 606624.

The previous prime is 909917. The next prime is 909971. The reversal of 909939 is 939909.

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

It is not a de Polignac number, because 909939 - 2⁵ = 909907 is a prime.

It is a D-number.

It is a Duffinian number.

909939 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 909897 and 909906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (909239) 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, 151654 + ... + 151659.

It is an arithmetic number, because the mean of its divisors is an integer number (303314).

2⁹⁰⁹⁹³⁹ is an apocalyptic number.

909939 is a deficient number, since it is larger than the sum of its proper divisors (303317).

909939 is a wasteful number, since it uses less digits than its factorization.

909939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303316.

The product of its (nonzero) digits is 19683, while the sum is 39.

The square root of 909939 is about 953.9072281936. The cubic root of 909939 is about 96.9030455047.

The spelling of 909939 in words is "nine hundred nine thousand, nine hundred thirty-nine".