840900 has 36 divisors (see below), whose sum is σ = 2433872. Its totient is φ = 224160.

The previous prime is 840863. The next prime is 840907. The reversal of 840900 is 9048.

It is a super-2 number, since 2×840900² = 1414225620000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (840907) by changing a digit.

840900 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, 1102 + ... + 1701.

2⁸⁴⁰⁹⁰⁰ is an apocalyptic number.

It is an amenable number.

840900 is an abundant number, since it is smaller than the sum of its proper divisors (1592972).

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

840900 is a wasteful number, since it uses less digits than its factorization.

840900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820 (or 2813 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 840900 is about 917.0059977994. The cubic root of 840900 is about 94.3875653927.

Adding to 840900 its reverse (9048), we get a palindrome (849948).

The spelling of 840900 in words is "eight hundred forty thousand, nine hundred".