4025721 has 16 divisors (see below), whose sum is σ = 6251904. Its totient is φ = 2256384.

The previous prime is 4025717. The next prime is 4025743. The reversal of 4025721 is 1275204.

It is not a de Polignac number, because 4025721 - 2² = 4025717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (4025521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 696 + ... + 2921.

It is an arithmetic number, because the mean of its divisors is an integer number (390744).

Almost surely, 2^4025721 is an apocalyptic number.

It is an amenable number.

4025721 is a deficient number, since it is larger than the sum of its proper divisors (2226183).

4025721 is a wasteful number, since it uses less digits than its factorization.

4025721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3680.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 4025721 is about 2006.4199460731. The cubic root of 4025721 is about 159.0796246888.

The spelling of 4025721 in words is "four million, twenty-five thousand, seven hundred twenty-one".