4056921 has 24 divisors (see below), whose sum is σ = 6548256. Its totient is φ = 2399040.

The previous prime is 4056919. The next prime is 4056967. The reversal of 4056921 is 1296504.

It is not a de Polignac number, because 4056921 - 2¹ = 4056919 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4056971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3781 + ... + 4733.

It is an arithmetic number, because the mean of its divisors is an integer number (272844).

Almost surely, 2^4056921 is an apocalyptic number.

It is an amenable number.

4056921 is a deficient number, since it is larger than the sum of its proper divisors (2491335).

4056921 is a wasteful number, since it uses less digits than its factorization.

4056921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013 (or 1010 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 4056921 is about 2014.1799820274. The cubic root of 4056921 is about 159.4895319761.

The spelling of 4056921 in words is "four million, fifty-six thousand, nine hundred twenty-one".