3973973581 has 4 divisors (see below), whose sum is σ = 3975455232. Its totient is φ = 3972491932.

The previous prime is 3973973561. The next prime is 3973973587. The reversal of 3973973581 is 1853793793.

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.

It is a cyclic number.

It is not a de Polignac number, because 3973973581 - 2²⁵ = 3940419149 is a prime.

It is a super-2 number, since 2×3973973581² = 31584932044971927122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3973973587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 736795 + ... + 742168.

It is an arithmetic number, because the mean of its divisors is an integer number (993863808).

Almost surely, 2^3973973581 is an apocalyptic number.

It is an amenable number.

3973973581 is a deficient number, since it is larger than the sum of its proper divisors (1481651).

3973973581 is a wasteful number, since it uses less digits than its factorization.

3973973581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481650.

The product of its digits is 4286520, while the sum is 55.

The square root of 3973973581 is about 63039.4605068920. The cubic root of 3973973581 is about 1583.9506939991.

The spelling of 3973973581 in words is "three billion, nine hundred seventy-three million, nine hundred seventy-three thousand, five hundred eighty-one".