3973581 has 12 divisors (see below), whose sum is σ = 5765760. Its totient is φ = 2637000.

The previous prime is 3973579. The next prime is 3973633. The reversal of 3973581 is 1853793.

3973581 is a `hidden beast` number, since 3 + 9 + 73 + 581 = 666.

It is not a de Polignac number, because 3973581 - 2¹ = 3973579 is a prime.

It is a super-2 number, since 2×3973581² = 31578691927122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3973511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1380 + ... + 3138.

It is an arithmetic number, because the mean of its divisors is an integer number (480480).

Almost surely, 2^3973581 is an apocalyptic number.

It is an amenable number.

3973581 is a deficient number, since it is larger than the sum of its proper divisors (1792179).

3973581 is a wasteful number, since it uses less digits than its factorization.

3973581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2016 (or 2013 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 3973581 is about 1993.3843081554. The cubic root of 3973581 is about 158.3898533828.

It can be divided in two parts, 3973 and 581, that added together give a palindrome (4554).

The spelling of 3973581 in words is "three million, nine hundred seventy-three thousand, five hundred eighty-one".