4020025 has 9 divisors (see below), whose sum is σ = 4997293. Its totient is φ = 3208000.

The previous prime is 4020017. The next prime is 4020031. The reversal of 4020025 is 5200204.

It is a happy number.

The square root of 4020025 is 2005.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1075369 + 2944656 = 1037^2 + 1716^2 .

It is not a de Polignac number, because 4020025 - 2³ = 4020017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4019987 and 4020014.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9825 + ... + 10225.

Almost surely, 2^4020025 is an apocalyptic number.

4020025 is the 2005-th square number.

4020025 is the 1003-rd centered octagonal number.

It is an amenable number.

4020025 is a deficient number, since it is larger than the sum of its proper divisors (977268).

4020025 is an frugal number, since it uses more digits than its factorization.

4020025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 13.

The cubic root of 4020025 is about 159.0045619249.

Adding to 4020025 its reverse (5200204), we get a palindrome (9220229).

The spelling of 4020025 in words is "four million, twenty thousand, twenty-five".