3978925 has 6 divisors (see below), whose sum is σ = 4933898. Its totient is φ = 3183120.

The previous prime is 3978917. The next prime is 3978967. The reversal of 3978925 is 5298793.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 145161 + 3833764 = 381^2 + 1958^2 .

It is not a de Polignac number, because 3978925 - 2³ = 3978917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79554 + ... + 79603.

Almost surely, 2^3978925 is an apocalyptic number.

It is an amenable number.

3978925 is a deficient number, since it is larger than the sum of its proper divisors (954973).

3978925 is a wasteful number, since it uses less digits than its factorization.

3978925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159167 (or 159162 counting only the distinct ones).

The product of its digits is 136080, while the sum is 43.

The square root of 3978925 is about 1994.7242917256. The cubic root of 3978925 is about 158.4608268286.

The spelling of 3978925 in words is "three million, nine hundred seventy-eight thousand, nine hundred twenty-five".