900040 has 16 divisors (see below), whose sum is σ = 2025180. Its totient is φ = 360000.

The previous prime is 900037. The next prime is 900061. The reversal of 900040 is 40009.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 813604 + 86436 = 902^2 + 294^2 .

It is a plaindrome in base 13.

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, 11211 + ... + 11290.

2⁹⁰⁰⁰⁴⁰ is an apocalyptic number.

It is an amenable number.

900040 is an abundant number, since it is smaller than the sum of its proper divisors (1125140).

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

900040 is a wasteful number, since it uses less digits than its factorization.

900040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22512 (or 22508 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 900040 is about 948.7043796673. The cubic root of 900040 is about 96.5503687940.

Adding to 900040 its reverse (40009), we get a palindrome (940049).

It can be divided in two parts, 9000 and 40, that multiplied together give a square (360000 = 600²).

The spelling of 900040 in words is "nine hundred thousand, forty".