4221920 has 24 divisors (see below), whose sum is σ = 9974664. Its totient is φ = 1688704.

The previous prime is 4221913. The next prime is 4221923. The reversal of 4221920 is 291224.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 4221892 and 4221901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13034 + ... + 13353.

It is an arithmetic number, because the mean of its divisors is an integer number (415611).

Almost surely, 2^4221920 is an apocalyptic number.

4221920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4221920 is an abundant number, since it is smaller than the sum of its proper divisors (5752744).

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

4221920 is a wasteful number, since it uses less digits than its factorization.

4221920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26402 (or 26394 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 4221920 is about 2054.7311259627. The cubic root of 4221920 is about 161.6230630744.

The spelling of 4221920 in words is "four million, two hundred twenty-one thousand, nine hundred twenty".