3949857520 has 160 divisors (see below), whose sum is σ = 11160999936. Its totient is φ = 1269043200.

The previous prime is 3949857481. The next prime is 3949857533. The reversal of 3949857520 is 257589493.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2579155 + ... + 2580685.

Almost surely, 2^3949857520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3949857520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5580499968).

3949857520 is an abundant number, since it is smaller than the sum of its proper divisors (7211142416).

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

3949857520 is a wasteful number, since it uses less digits than its factorization.

3949857520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839 (or 1833 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 52.

The square root of 3949857520 is about 62847.8919296423. The cubic root of 3949857520 is about 1580.7401221911.

The spelling of 3949857520 in words is "three billion, nine hundred forty-nine million, eight hundred fifty-seven thousand, five hundred twenty".