900550 has 48 divisors (see below), whose sum is σ = 1999872. Its totient is φ = 295200.

The previous prime is 900539. The next prime is 900551. The reversal of 900550 is 55009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900551) 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 23 ways as a sum of consecutive naturals, for example, 10809 + ... + 10891.

It is an arithmetic number, because the mean of its divisors is an integer number (41664).

2⁹⁰⁰⁵⁵⁰ is an apocalyptic number.

900550 is the 775-th pentagonal number.

900550 is an abundant number, since it is smaller than the sum of its proper divisors (1099322).

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

900550 is a wasteful number, since it uses less digits than its factorization.

900550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 900550 is about 948.9731292297. The cubic root of 900550 is about 96.5686018320.

Adding to 900550 its reverse (55009), we get a palindrome (955559).

The spelling of 900550 in words is "nine hundred thousand, five hundred fifty".