3991425 has 24 divisors (see below), whose sum is σ = 6948960. Its totient is φ = 2016000.

The previous prime is 3991399. The next prime is 3991441. The reversal of 3991425 is 5241993.

It is not a de Polignac number, because 3991425 - 2⁷ = 3991297 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25 + ... + 2825.

It is an arithmetic number, because the mean of its divisors is an integer number (289540).

Almost surely, 2^3991425 is an apocalyptic number.

It is an amenable number.

3991425 is a deficient number, since it is larger than the sum of its proper divisors (2957535).

3991425 is a wasteful number, since it uses less digits than its factorization.

3991425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2833 (or 2828 counting only the distinct ones).

The product of its digits is 9720, while the sum is 33.

The square root of 3991425 is about 1997.8550998508. The cubic root of 3991425 is about 158.6265910093.

The spelling of 3991425 in words is "three million, nine hundred ninety-one thousand, four hundred twenty-five".