3997969 has 8 divisors (see below), whose sum is σ = 4185000. Its totient is φ = 3814272.

The previous prime is 3997967. The next prime is 3997979. The reversal of 3997969 is 9697993.

It can be written as a sum of positive squares in 4 ways, for example, as 97344 + 3900625 = 312^2 + 1975^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3997969 - 2¹ = 3997967 is a prime.

It is a super-2 number, since 2×3997969² = 31967512249922, which contains 22 as substring.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 1807 + ... + 3355.

It is an arithmetic number, because the mean of its divisors is an integer number (523125).

Almost surely, 2^3997969 is an apocalyptic number.

It is an amenable number.

3997969 is a deficient number, since it is larger than the sum of its proper divisors (187031).

3997969 is a wasteful number, since it uses less digits than its factorization.

3997969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667.

The product of its digits is 826686, while the sum is 52.

The square root of 3997969 is about 1999.4921855311. The cubic root of 3997969 is about 158.7132338855.

The spelling of 3997969 in words is "three million, nine hundred ninety-seven thousand, nine hundred sixty-nine".