905490 has 24 divisors (see below), whose sum is σ = 2354508. Its totient is φ = 241440.

The previous prime is 905477. The next prime is 905491. The reversal of 905490 is 94509.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 904401 + 1089 = 951^2 + 33^2 .

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (905491) by changing a digit.

905490 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4941 + ... + 5120.

2⁹⁰⁵⁴⁹⁰ is an apocalyptic number.

905490 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

905490 is an abundant number, since it is smaller than the sum of its proper divisors (1449018).

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

905490 is a wasteful number, since it uses less digits than its factorization.

905490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10074 (or 10071 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 905490 is about 951.5723829536. The cubic root of 905490 is about 96.7448568065.

Adding to 905490 its reverse (94509), we get a palindrome (999999).

The spelling of 905490 in words is "nine hundred five thousand, four hundred ninety".