1005456 has 20 divisors (see below), whose sum is σ = 2597552. Its totient is φ = 335136.

The previous prime is 1005439. The next prime is 1005457. The reversal of 1005456 is 6545001.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1005457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10426 + ... + 10521.

2^1005456 is an apocalyptic number.

1005456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1005456 is an abundant number, since it is smaller than the sum of its proper divisors (1592096).

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

1005456 is a wasteful number, since it uses less digits than its factorization.

1005456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20958 (or 20952 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1005456 is about 1002.7242891244. The cubic root of 1005456 is about 100.1815369107.

The spelling of 1005456 in words is "one million, five thousand, four hundred fifty-six".