3974520861 has 12 divisors (see below), whose sum is σ = 5741723260. Its totient is φ = 2649335040.

The previous prime is 3974520859. The next prime is 3974520877. The reversal of 3974520861 is 1680254793.

3974520861 is digitally balanced in base 2, base 4 and base 10, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2499500025 + 1475020836 = 49995^2 + 38406^2 .

It is not a de Polignac number, because 3974520861 - 2¹ = 3974520859 is a prime.

It is a Duffinian number.

3974520861 is strictly pandigital in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3974520161) 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, 57741 + ... + 106221.

It is a 1-persistent number, because it is pandigital, but 2⋅3974520861 = 7949041722 is not.

Almost surely, 2^3974520861 is an apocalyptic number.

It is an amenable number.

3974520861 is a deficient number, since it is larger than the sum of its proper divisors (1767202399).

3974520861 is a wasteful number, since it uses less digits than its factorization.

3974520861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57596 (or 57593 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 3974520861 is about 63043.8011306425. The cubic root of 3974520861 is about 1584.0234024798.

It can be divided in two parts, 39745 and 20861, that added together give a palindrome (60606).

The spelling of 3974520861 in words is "three billion, nine hundred seventy-four million, five hundred twenty thousand, eight hundred sixty-one".