999999456 has 48 divisors (see below), whose sum is σ = 2627133264. Its totient is φ = 333062144.

The previous prime is 999999433. The next prime is 999999487. The reversal of 999999456 is 654999999.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139840 + ... + 146816.

It is an arithmetic number, because the mean of its divisors is an integer number (54731943).

Almost surely, 2^999999456 is an apocalyptic number.

999999456 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

999999456 is an abundant number, since it is smaller than the sum of its proper divisors (1627133808).

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

999999456 is a wasteful number, since it uses less digits than its factorization.

999999456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8483 (or 8475 counting only the distinct ones).

The product of its digits is 63772920, while the sum is 69.

The square root of 999999456 is about 31622.7680002874. The cubic root of 999999456 is about 999.9998186666. Note that the first 3 decimals are identical.

The spelling of 999999456 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, four hundred fifty-six".