909640 has 16 divisors (see below), whose sum is σ = 2046780. Its totient is φ = 363840.

The previous prime is 909637. The next prime is 909679. The reversal of 909640 is 46909.

It can be written as a sum of positive squares in 2 ways, for example, as 820836 + 88804 = 906^2 + 298^2 .

It is a junction number, because it is equal to n+sod(n) for n = 909599 and 909608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11331 + ... + 11410.

2⁹⁰⁹⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

909640 is an abundant number, since it is smaller than the sum of its proper divisors (1137140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

909640 is a wasteful number, since it uses less digits than its factorization.

909640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22752 (or 22748 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 909640 is about 953.7504914809. The cubic root of 909640 is about 96.8924304397.

It can be divided in two parts, 90 and 9640, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 909640 in words is "nine hundred nine thousand, six hundred forty".