3681973 has 4 divisors (see below), whose sum is σ = 3685900. Its totient is φ = 3678048.

The previous prime is 3681967. The next prime is 3682031. The reversal of 3681973 is 3791863.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1350244 + 2331729 = 1162^2 + 1527^2 .

It is a cyclic number.

It is not a de Polignac number, because 3681973 - 2¹³ = 3673781 is a prime.

It is a Duffinian number.

3681973 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3681373) 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, 361 + ... + 2737.

It is an arithmetic number, because the mean of its divisors is an integer number (921475).

Almost surely, 2^3681973 is an apocalyptic number.

It is an amenable number.

3681973 is a deficient number, since it is larger than the sum of its proper divisors (3927).

3681973 is a wasteful number, since it uses less digits than its factorization.

3681973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3926.

The product of its digits is 27216, while the sum is 37.

The square root of 3681973 is about 1918.8467890897. The cubic root of 3681973 is about 154.4164390713.

The spelling of 3681973 in words is "three million, six hundred eighty-one thousand, nine hundred seventy-three".