3974568781 has 4 divisors (see below), whose sum is σ = 3978395200. Its totient is φ = 3970742364.

The previous prime is 3974568769. The next prime is 3974568799. The reversal of 3974568781 is 1878654793.

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 an emirpimes, since its reverse is a distinct semiprime: 1878654793 = 3037 ⋅618589.

It is a cyclic number.

It is not a de Polignac number, because 3974568781 - 2¹¹ = 3974566733 is a prime.

It is a super-2 number, since 2×3974568781² = 31594393989799651922, 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 (3974568721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1911651 + ... + 1913728.

It is an arithmetic number, because the mean of its divisors is an integer number (994598800).

Almost surely, 2^3974568781 is an apocalyptic number.

It is an amenable number.

3974568781 is a deficient number, since it is larger than the sum of its proper divisors (3826419).

3974568781 is a wasteful number, since it uses less digits than its factorization.

3974568781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3826418.

The product of its digits is 10160640, while the sum is 58.

The square root of 3974568781 is about 63044.1811827230. The cubic root of 3974568781 is about 1584.0297685383.

The spelling of 3974568781 in words is "three billion, nine hundred seventy-four million, five hundred sixty-eight thousand, seven hundred eighty-one".