3949864526520 has 256 divisors, whose sum is σ = 14559902323200. Its totient is φ = 944425681920.

The previous prime is 3949864526497. The next prime is 3949864526551. The reversal of 3949864526520 is 256254689493.

It is a happy number.

3949864526520 is a `hidden beast` number, since 3 + 9 + 4 + 9 + 86 + 4 + 5 + 26 + 520 = 666.

3949864526520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-4 number, since 4×3949864526520⁴ (a number of 51 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1410022 + ... + 3144501.

It is an arithmetic number, because the mean of its divisors is an integer number (56874618450).

Almost surely, 2^{3949864526520} is an apocalyptic number.

3949864526520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3949864526520 is an abundant number, since it is smaller than the sum of its proper divisors (10610037796680).

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

3949864526520 is a wasteful number, since it uses less digits than its factorization.

3949864526520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4554627 (or 4554617 counting only the distinct ones).

The product of its (nonzero) digits is 111974400, while the sum is 63.

The spelling of 3949864526520 in words is "three trillion, nine hundred forty-nine billion, eight hundred sixty-four million, five hundred twenty-six thousand, five hundred twenty".