999406 has 8 divisors (see below), whose sum is σ = 1534104. Its totient is φ = 488040.

The previous prime is 999389. The next prime is 999431. The reversal of 999406 is 604999.

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

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

999406 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5725 + ... + 5896.

It is an arithmetic number, because the mean of its divisors is an integer number (191763).

2⁹⁹⁹⁴⁰⁶ is an apocalyptic number.

999406 is a deficient number, since it is larger than the sum of its proper divisors (534698).

999406 is a wasteful number, since it uses less digits than its factorization.

999406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11666.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 999406 is about 999.7029558824. The cubic root of 999406 is about 99.9801960783.

The spelling of 999406 in words is "nine hundred ninety-nine thousand, four hundred six".