9999420 has 24 divisors (see below), whose sum is σ = 27998544. Its totient is φ = 2666496.

The previous prime is 9999419. The next prime is 9999433. The reversal of 9999420 is 249999.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83269 + ... + 83388.

It is an arithmetic number, because the mean of its divisors is an integer number (1166606).

Almost surely, 2^9999420 is an apocalyptic number.

It is an amenable number.

9999420 is an abundant number, since it is smaller than the sum of its proper divisors (17999124).

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

9999420 is a wasteful number, since it uses less digits than its factorization.

9999420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166669 (or 166667 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 9999420 is about 3162.1859527865. The cubic root of 9999420 is about 215.4393036823.

The spelling of 9999420 in words is "nine million, nine hundred ninety-nine thousand, four hundred twenty".