999456 has 48 divisors (see below), whose sum is σ = 2721600. Its totient is φ = 320768.

The previous prime is 999451. The next prime is 999491. The reversal of 999456 is 654999.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (999451) 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, 2605 + ... + 2963.

It is an arithmetic number, because the mean of its divisors is an integer number (56700).

2⁹⁹⁹⁴⁵⁶ is an apocalyptic number.

999456 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1360800).

999456 is an abundant number, since it is smaller than the sum of its proper divisors (1722144).

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

999456 is a wasteful number, since it uses less digits than its factorization.

999456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 393 counting only the distinct ones).

The product of its digits is 87480, while the sum is 42.

The square root of 999456 is about 999.7279629979. The cubic root of 999456 is about 99.9818633775.

The spelling of 999456 in words is "nine hundred ninety-nine thousand, four hundred fifty-six".