3999925 has 12 divisors (see below), whose sum is σ = 4991620. Its totient is φ = 3179520.

The previous prime is 3999923. The next prime is 3999929. The reversal of 3999925 is 5299993.

It is a happy number.

3999925 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 224676 + 3775249 = 474^2 + 1943^2 .

It is not a de Polignac number, because 3999925 - 2¹ = 3999923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4411 + ... + 5239.

Almost surely, 2^3999925 is an apocalyptic number.

It is an amenable number.

3999925 is a deficient number, since it is larger than the sum of its proper divisors (991695).

3999925 is a wasteful number, since it uses less digits than its factorization.

3999925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032 (or 1027 counting only the distinct ones).

The product of its digits is 196830, while the sum is 46.

The square root of 3999925 is about 1999.9812499121. The cubic root of 3999925 is about 158.7391130650.

The spelling of 3999925 in words is "three million, nine hundred ninety-nine thousand, nine hundred twenty-five".