3973781 has 8 divisors (see below), whose sum is σ = 4627584. Its totient is φ = 3341520.

The previous prime is 3973757. The next prime is 3973787. The reversal of 3973781 is 1873793.

It is a happy number.

3973781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 3973781 - 2¹⁰ = 3972757 is a prime.

It is a super-2 number, since 2×3973781² = 31581870871922, 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 (3973787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4985 + ... + 5726.

It is an arithmetic number, because the mean of its divisors is an integer number (578448).

Almost surely, 2^3973781 is an apocalyptic number.

It is an amenable number.

3973781 is a deficient number, since it is larger than the sum of its proper divisors (653803).

3973781 is a wasteful number, since it uses less digits than its factorization.

3973781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10771.

The product of its digits is 31752, while the sum is 38.

The square root of 3973781 is about 1993.4344734653. The cubic root of 3973781 is about 158.3925107205.

The spelling of 3973781 in words is "three million, nine hundred seventy-three thousand, seven hundred eighty-one".