999457 has 8 divisors (see below), whose sum is σ = 1078560. Its totient is φ = 923040.

The previous prime is 999451. The next prime is 999491. The reversal of 999457 is 754999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999457 - 2⁷ = 999329 is a prime.

It is a Duffinian number.

999457 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (999451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138 + ... + 1420.

It is an arithmetic number, because the mean of its divisors is an integer number (134820).

2⁹⁹⁹⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

999457 is a deficient number, since it is larger than the sum of its proper divisors (79103).

999457 is a wasteful number, since it uses less digits than its factorization.

999457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343.

The product of its digits is 102060, while the sum is 43.

The square root of 999457 is about 999.7284631339. The cubic root of 999457 is about 99.9818967229.

The spelling of 999457 in words is "nine hundred ninety-nine thousand, four hundred fifty-seven".