999407 has 4 divisors (see below), whose sum is σ = 1026456. Its totient is φ = 972360.

The previous prime is 999389. The next prime is 999431. The reversal of 999407 is 704999.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 999407 - 2¹⁸ = 737263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999437) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13469 + ... + 13542.

It is an arithmetic number, because the mean of its divisors is an integer number (256614).

2⁹⁹⁹⁴⁰⁷ is an apocalyptic number.

999407 is a deficient number, since it is larger than the sum of its proper divisors (27049).

999407 is a wasteful number, since it uses less digits than its factorization.

999407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27048.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 999407 is about 999.7034560308. The cubic root of 999407 is about 99.9802294248.

The spelling of 999407 in words is "nine hundred ninety-nine thousand, four hundred seven".