3999697 has 4 divisors (see below), whose sum is σ = 4307380. Its totient is φ = 3692016.

The previous prime is 3999683. The next prime is 3999703. The reversal of 3999697 is 7969993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1806336 + 2193361 = 1344^2 + 1481^2 .

It is a cyclic number.

It is not a de Polignac number, because 3999697 - 2¹¹ = 3997649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3999637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153822 + ... + 153847.

It is an arithmetic number, because the mean of its divisors is an integer number (1076845).

Almost surely, 2^3999697 is an apocalyptic number.

It is an amenable number.

3999697 is a deficient number, since it is larger than the sum of its proper divisors (307683).

3999697 is a wasteful number, since it uses less digits than its factorization.

3999697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307682.

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

The square root of 3999697 is about 1999.9242485654. The cubic root of 3999697 is about 158.7360969080.

The spelling of 3999697 in words is "three million, nine hundred ninety-nine thousand, six hundred ninety-seven".