890840 has 16 divisors (see below), whose sum is σ = 2004480. Its totient is φ = 356320.

The previous prime is 890833. The next prime is 890843. The reversal of 890840 is 48098.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (890843) by changing a digit.

890840 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 3 ways as a sum of consecutive naturals, for example, 11096 + ... + 11175.

It is an arithmetic number, because the mean of its divisors is an integer number (125280).

2⁸⁹⁰⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

890840 is an abundant number, since it is smaller than the sum of its proper divisors (1113640).

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

890840 is a wasteful number, since it uses less digits than its factorization.

890840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22282 (or 22278 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 890840 is about 943.8432073178. The cubic root of 890840 is about 96.2202696730.

The spelling of 890840 in words is "eight hundred ninety thousand, eight hundred forty".