3985655625 has 240 divisors, whose sum is σ = 8951534592. Its totient is φ = 1732104000.

The previous prime is 3985655621. The next prime is 3985655689. The reversal of 3985655625 is 5265565893.

3985655625 is a `hidden beast` number, since 3 + 9 + 8 + 5 + 6 + 5 + 5 + 625 = 666.

It is not a de Polignac number, because 3985655625 - 2² = 3985655621 is a prime.

It is a super-2 number, since 2×3985655625² = 31770901522188281250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3985655621) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 24451794 + ... + 24451956.

Almost surely, 2^3985655625 is an apocalyptic number.

3985655625 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3985655625 is an abundant number, since it is smaller than the sum of its proper divisors (4965878967).

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

3985655625 is an equidigital number, since it uses as much as digits as its factorization.

3985655625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 201 counting only the distinct ones).

The product of its digits is 9720000, while the sum is 54.

The square root of 3985655625 is about 63132.0491113666. The cubic root of 3985655625 is about 1585.5012562096.

It can be divided in two parts, 39856 and 55625, that added together give a square (95481 = 309²).

The spelling of 3985655625 in words is "three billion, nine hundred eighty-five million, six hundred fifty-five thousand, six hundred twenty-five".