4321820 has 12 divisors (see below), whose sum is σ = 9075864. Its totient is φ = 1728720.

The previous prime is 4321817. The next prime is 4321829. The reversal of 4321820 is 281234.

4321820 = 309² + 310² + ... + 348².

It is a super-2 number, since 2×4321820² = 37356256224800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 216091 = 4321820 / (4 + 3 + 2 + 1 + 8 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 4321792 and 4321801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4321829) 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, 108026 + ... + 108065.

It is an arithmetic number, because the mean of its divisors is an integer number (756322).

Almost surely, 2^4321820 is an apocalyptic number.

It is an amenable number.

4321820 is an abundant number, since it is smaller than the sum of its proper divisors (4754044).

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

4321820 is a wasteful number, since it uses less digits than its factorization.

4321820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216100 (or 216098 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 4321820 is about 2078.8987469331. The cubic root of 4321820 is about 162.8879252663.

The spelling of 4321820 in words is "four million, three hundred twenty-one thousand, eight hundred twenty".