8429920 has 96 divisors (see below), whose sum is σ = 21772800. Its totient is φ = 3073536.

The previous prime is 8429917. The next prime is 8429947. The reversal of 8429920 is 299248.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142851 + ... + 142909.

It is an arithmetic number, because the mean of its divisors is an integer number (226800).

Almost surely, 2^8429920 is an apocalyptic number.

8429920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8429920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10886400).

8429920 is an abundant number, since it is smaller than the sum of its proper divisors (13342880).

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

8429920 is a wasteful number, since it uses less digits than its factorization.

8429920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 8429920 is about 2903.4324514271. The cubic root of 8429920 is about 203.5203391705.

The spelling of 8429920 in words is "eight million, four hundred twenty-nine thousand, nine hundred twenty".