3985531956 has 72 divisors (see below), whose sum is σ = 11524880640. Its totient is φ = 1137623616.

The previous prime is 3985531939. The next prime is 3985531967. The reversal of 3985531956 is 6591355893.

It is a happy number.

3985531956 is a `hidden beast` number, since 39 + 8 + 553 + 1 + 9 + 56 = 666.

3985531956 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 274405 + ... + 288563.

Almost surely, 2^3985531956 is an apocalyptic number.

3985531956 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3985531956 is an abundant number, since it is smaller than the sum of its proper divisors (7539348684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3985531956 is a wasteful number, since it uses less digits than its factorization.

3985531956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15293 (or 15288 counting only the distinct ones).

The product of its digits is 4374000, while the sum is 54.

The square root of 3985531956 is about 63131.0696567071. The cubic root of 3985531956 is about 1585.4848574535.

The spelling of 3985531956 in words is "three billion, nine hundred eighty-five million, five hundred thirty-one thousand, nine hundred fifty-six".