3899925 has 18 divisors (see below), whose sum is σ = 6985602. Its totient is φ = 2079840.

The previous prime is 3899887. The next prime is 3899927. The reversal of 3899925 is 5299983.

It can be written as a sum of positive squares in 3 ways, for example, as 3249 + 3896676 = 57^2 + 1974^2 .

It is not a de Polignac number, because 3899925 - 2¹¹ = 3897877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3899927) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8442 + ... + 8891.

It is an arithmetic number, because the mean of its divisors is an integer number (388089).

Almost surely, 2^3899925 is an apocalyptic number.

It is an amenable number.

3899925 is a deficient number, since it is larger than the sum of its proper divisors (3085677).

3899925 is a wasteful number, since it uses less digits than its factorization.

3899925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17349 (or 17341 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 3899925 is about 1974.8227768587. The cubic root of 3899925 is about 157.4050826433.

The spelling of 3899925 in words is "three million, eight hundred ninety-nine thousand, nine hundred twenty-five".