4390625 has 14 divisors (see below), whose sum is σ = 5507742. Its totient is φ = 3500000.

The previous prime is 4390621. The next prime is 4390651. The reversal of 4390625 is 5260934.

It can be written as a sum of positive squares in 7 ways, for example, as 4376464 + 14161 = 2092^2 + 119^2 .

It is not a de Polignac number, because 4390625 - 2² = 4390621 is a prime.

It is a d-powerful number, because it can be written as 4¹¹ + 3¹¹ + 9² + 0 + 6⁵ + 2¹³ + 5⁵ .

It is a Duffinian number.

It is a nialpdrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (4390621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 15485 + ... + 15765.

Almost surely, 2^4390625 is an apocalyptic number.

It is an amenable number.

4390625 is a deficient number, since it is larger than the sum of its proper divisors (1117117).

4390625 is an frugal number, since it uses more digits than its factorization.

4390625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 4390625 is about 2095.3818267800. The cubic root of 4390625 is about 163.7477905030.

It can be divided in two parts, 4 and 390625, that multiplied together give a square (1562500 = 1250²).

The spelling of 4390625 in words is "four million, three hundred ninety thousand, six hundred twenty-five".