4028921 has 8 divisors (see below), whose sum is σ = 4394880. Its totient is φ = 3670992.

The previous prime is 4028917. The next prime is 4028923. The reversal of 4028921 is 1298204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4028921 - 2² = 4028917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4028923) 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, 935 + ... + 2988.

It is an arithmetic number, because the mean of its divisors is an integer number (549360).

Almost surely, 2^4028921 is an apocalyptic number.

It is an amenable number.

4028921 is a deficient number, since it is larger than the sum of its proper divisors (365959).

4028921 is a wasteful number, since it uses less digits than its factorization.

4028921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4015.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 4028921 is about 2007.2172279053. The cubic root of 4028921 is about 159.1217637224.

The spelling of 4028921 in words is "four million, twenty-eight thousand, nine hundred twenty-one".