3681997 has 4 divisors (see below), whose sum is σ = 4016736. Its totient is φ = 3347260.

The previous prime is 3681967. The next prime is 3682031. The reversal of 3681997 is 7991863.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7991863 = 11 ⋅726533.

It is a cyclic number.

It is not a de Polignac number, because 3681997 - 2¹⁵ = 3649229 is a prime.

It is a Duffinian number.

3681997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3681917) 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, 167353 + ... + 167374.

It is an arithmetic number, because the mean of its divisors is an integer number (1004184).

Almost surely, 2^3681997 is an apocalyptic number.

It is an amenable number.

3681997 is a deficient number, since it is larger than the sum of its proper divisors (334739).

3681997 is a wasteful number, since it uses less digits than its factorization.

3681997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334738.

The product of its digits is 81648, while the sum is 43.

The square root of 3681997 is about 1918.8530428357. The cubic root of 3681997 is about 154.4167745786.

The spelling of 3681997 in words is "three million, six hundred eighty-one thousand, nine hundred ninety-seven".