4218728 has 16 divisors (see below), whose sum is σ = 8165760. Its totient is φ = 2041200.

The previous prime is 4218713. The next prime is 4218733. The reversal of 4218728 is 8278124.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 4218694 and 4218703.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8258 + ... + 8753.

It is an arithmetic number, because the mean of its divisors is an integer number (510360).

Almost surely, 2^4218728 is an apocalyptic number.

It is an amenable number.

4218728 is a deficient number, since it is larger than the sum of its proper divisors (3947032).

4218728 is a wasteful number, since it uses less digits than its factorization.

4218728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17048 (or 17044 counting only the distinct ones).

The product of its digits is 7168, while the sum is 32.

The square root of 4218728 is about 2053.9542351279. The cubic root of 4218728 is about 161.5823208775.

The spelling of 4218728 in words is "four million, two hundred eighteen thousand, seven hundred twenty-eight".