3997965 has 16 divisors (see below), whose sum is σ = 6436800. Its totient is φ = 2118912.

The previous prime is 3997963. The next prime is 3997967. The reversal of 3997965 is 5697993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3997963) and next prime (3997967).

It is not a de Polignac number, because 3997965 - 2¹ = 3997963 is a prime.

It is a Curzon number.

3997965 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3997963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1941 + ... + 3429.

It is an arithmetic number, because the mean of its divisors is an integer number (402300).

Almost surely, 2^3997965 is an apocalyptic number.

It is an amenable number.

3997965 is a deficient number, since it is larger than the sum of its proper divisors (2438835).

3997965 is a wasteful number, since it uses less digits than its factorization.

3997965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676.

The product of its digits is 459270, while the sum is 48.

The square root of 3997965 is about 1999.4911852769. The cubic root of 3997965 is about 158.7131809542.

The spelling of 3997965 in words is "three million, nine hundred ninety-seven thousand, nine hundred sixty-five".