3974787781 has 4 divisors (see below), whose sum is σ = 3974920000. Its totient is φ = 3974655564.

The previous prime is 3974787767. The next prime is 3974787811. The reversal of 3974787781 is 1877874793.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3974787781 - 2⁷ = 3974787653 is a prime.

It is a super-2 number, since 2×3974787781² = 31597875807973807922, 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 (3974787701) 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, 3220 + ... + 89218.

It is an arithmetic number, because the mean of its divisors is an integer number (993730000).

Almost surely, 2^3974787781 is an apocalyptic number.

It is an amenable number.

3974787781 is a deficient number, since it is larger than the sum of its proper divisors (132219).

3974787781 is an equidigital number, since it uses as much as digits as its factorization.

3974787781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132218.

The product of its digits is 16595712, while the sum is 61.

The square root of 3974787781 is about 63045.9180359839. The cubic root of 3974787781 is about 1584.0588615181.

The spelling of 3974787781 in words is "three billion, nine hundred seventy-four million, seven hundred eighty-seven thousand, seven hundred eighty-one".