909945 has 24 divisors (see below), whose sum is σ = 1604616. Its totient is φ = 476928.

The previous prime is 909917. The next prime is 909971. The reversal of 909945 is 549909.

It can be written as a sum of positive squares in 4 ways, for example, as 28224 + 881721 = 168^2 + 939^2 .

It is not a de Polignac number, because 909945 - 2¹⁷ = 778873 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 909945.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3147 + ... + 3423.

It is an arithmetic number, because the mean of its divisors is an integer number (66859).

2⁹⁰⁹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

909945 is a deficient number, since it is larger than the sum of its proper divisors (694671).

909945 is a wasteful number, since it uses less digits than its factorization.

909945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 909945 is about 953.9103731483. The cubic root of 909945 is about 96.9032584922.

Subtracting from 909945 its sum of digits (36), we obtain a palindrome (909909).

The spelling of 909945 in words is "nine hundred nine thousand, nine hundred forty-five".