3985531957 has 16 divisors (see below), whose sum is σ = 4506822144. Its totient is φ = 3491712000.

The previous prime is 3985531939. The next prime is 3985531967. The reversal of 3985531957 is 7591355893.

It is a cyclic number.

It is not a de Polignac number, because 3985531957 - 2³¹ = 1838048309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3985531898 and 3985531907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3985531937) 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 15 ways as a sum of consecutive naturals, for example, 57933 + ... + 106429.

It is an arithmetic number, because the mean of its divisors is an integer number (281676384).

Almost surely, 2^3985531957 is an apocalyptic number.

It is an amenable number.

3985531957 is a deficient number, since it is larger than the sum of its proper divisors (521290187).

3985531957 is a wasteful number, since it uses less digits than its factorization.

3985531957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48780.

The product of its digits is 5103000, while the sum is 55.

The square root of 3985531957 is about 63131.0696646271. The cubic root of 3985531957 is about 1585.4848575861.

It can be divided in two parts, 398 and 5531957, that added together give a palindrome (5532355).

The spelling of 3985531957 in words is "three billion, nine hundred eighty-five million, five hundred thirty-one thousand, nine hundred fifty-seven".