3997806 has 8 divisors (see below), whose sum is σ = 7995624. Its totient is φ = 1332600.

The previous prime is 3997801. The next prime is 3997811. The reversal of 3997806 is 6087993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3997801) and next prime (3997811).

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

3997806 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3997801) 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, 333145 + ... + 333156.

It is an arithmetic number, because the mean of its divisors is an integer number (999453).

Almost surely, 2^3997806 is an apocalyptic number.

3997806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3997806 is a wasteful number, since it uses less digits than its factorization.

3997806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666306.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 3997806 is about 1999.4514247663. The cubic root of 3997806 is about 158.7110769063.

The spelling of 3997806 in words is "three million, nine hundred ninety-seven thousand, eight hundred six".