909040 has 40 divisors (see below), whose sum is σ = 2307888. Its totient is φ = 330240.

The previous prime is 909037. The next prime is 909043. The reversal of 909040 is 40909.

It is an interprime number because it is at equal distance from previous prime (909037) and next prime (909043).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (909043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364 + ... + 1396.

2⁹⁰⁹⁰⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 909040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1153944).

909040 is an abundant number, since it is smaller than the sum of its proper divisors (1398848).

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

909040 is a wasteful number, since it uses less digits than its factorization.

909040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057 (or 1051 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 909040 is about 953.4358919193. The cubic root of 909040 is about 96.8711222867.

Adding to 909040 its reverse (40909), we get a palindrome (949949).

The spelling of 909040 in words is "nine hundred nine thousand, forty".