8438920 has 32 divisors (see below), whose sum is σ = 21700800. Its totient is φ = 2893248.

The previous prime is 8438917. The next prime is 8438921. The reversal of 8438920 is 298348.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (8438921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14790 + ... + 15349.

It is an arithmetic number, because the mean of its divisors is an integer number (678150).

Almost surely, 2^8438920 is an apocalyptic number.

It is an amenable number.

8438920 is an abundant number, since it is smaller than the sum of its proper divisors (13261880).

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

8438920 is a wasteful number, since it uses less digits than its factorization.

8438920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30157 (or 30153 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 8438920 is about 2904.9819276546. The cubic root of 8438920 is about 203.5927412648.

The spelling of 8438920 in words is "eight million, four hundred thirty-eight thousand, nine hundred twenty".