999420 has 24 divisors (see below), whose sum is σ = 2798544. Its totient is φ = 266496.

The previous prime is 999389. The next prime is 999431. The reversal of 999420 is 24999.

It is a happy number.

It is a nialpdrome in base 10.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

999420 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 7 ways as a sum of consecutive naturals, for example, 8269 + ... + 8388.

It is an arithmetic number, because the mean of its divisors is an integer number (116606).

2⁹⁹⁹⁴²⁰ is an apocalyptic number.

It is an amenable number.

999420 is an abundant number, since it is smaller than the sum of its proper divisors (1799124).

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

999420 is a wasteful number, since it uses less digits than its factorization.

999420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16669 (or 16667 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 999420 is about 999.7099579378. The cubic root of 999420 is about 99.9806629277.

The spelling of 999420 in words is "nine hundred ninety-nine thousand, four hundred twenty".