900390 has 16 divisors (see below), whose sum is σ = 2161008. Its totient is φ = 240096.

The previous prime is 900349. The next prime is 900397. The reversal of 900390 is 93009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14977 + ... + 15036.

It is an arithmetic number, because the mean of its divisors is an integer number (135063).

2⁹⁰⁰³⁹⁰ is an apocalyptic number.

900390 is an abundant number, since it is smaller than the sum of its proper divisors (1260618).

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

900390 is a wasteful number, since it uses less digits than its factorization.

900390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30023.

The product of its (nonzero) digits is 243, while the sum is 21.

The square root of 900390 is about 948.8888238355. Note that the first 4 decimals coincide. The cubic root of 900390 is about 96.5628824044.

Adding to 900390 its reverse (93009), we get a palindrome (993399).

The spelling of 900390 in words is "nine hundred thousand, three hundred ninety".