4028121 has 6 divisors (see below), whose sum is σ = 5818410. Its totient is φ = 2685408.

The previous prime is 4028093. The next prime is 4028137. The reversal of 4028121 is 1218204.

It can be written as a sum of positive squares in only one way, i.e., 2673225 + 1354896 = 1635^2 + 1164^2 .

It is not a de Polignac number, because 4028121 - 2⁷ = 4027993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4028094 and 4028103.

It is not an unprimeable number, because it can be changed into a prime (4028191) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 223776 + ... + 223793.

It is an arithmetic number, because the mean of its divisors is an integer number (969735).

Almost surely, 2^4028121 is an apocalyptic number.

It is an amenable number.

4028121 is a deficient number, since it is larger than the sum of its proper divisors (1790289).

4028121 is a wasteful number, since it uses less digits than its factorization.

4028121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447575 (or 447572 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 4028121 is about 2007.0179371396. The cubic root of 4028121 is about 159.1112310564. Note that the first 3 decimals are identical.

The spelling of 4028121 in words is "four million, twenty-eight thousand, one hundred twenty-one".