997854 has 32 divisors (see below), whose sum is σ = 2346624. Its totient is φ = 278880.

The previous prime is 997813. The next prime is 997877. The reversal of 997854 is 458799.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277 + ... + 1439.

It is an arithmetic number, because the mean of its divisors is an integer number (73332).

2⁹⁹⁷⁸⁵⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1173312).

997854 is an abundant number, since it is smaller than the sum of its proper divisors (1348770).

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

997854 is a wasteful number, since it uses less digits than its factorization.

997854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192.

The product of its digits is 90720, while the sum is 42.

The square root of 997854 is about 998.9264237170. The cubic root of 997854 is about 99.9284154354.

The spelling of 997854 in words is "nine hundred ninety-seven thousand, eight hundred fifty-four".