3999225 has 12 divisors (see below), whose sum is σ = 6612176. Its totient is φ = 2132880.

The previous prime is 3999211. The next prime is 3999239. The reversal of 3999225 is 5229993.

It is an interprime number because it is at equal distance from previous prime (3999211) and next prime (3999239).

It is not a de Polignac number, because 3999225 - 2⁴ = 3999209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 26587 + ... + 26736.

Almost surely, 2^3999225 is an apocalyptic number.

It is an amenable number.

3999225 is a deficient number, since it is larger than the sum of its proper divisors (2612951).

3999225 is a wasteful number, since it uses less digits than its factorization.

3999225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53336 (or 53331 counting only the distinct ones).

The product of its digits is 43740, while the sum is 39.

The square root of 3999225 is about 1999.8062406143. The cubic root of 3999225 is about 158.7298525695.

It can be divided in two parts, 3999 and 225, that added together give a palindrome (4224).

The spelling of 3999225 in words is "three million, nine hundred ninety-nine thousand, two hundred twenty-five".