3947208340 has 24 divisors (see below), whose sum is σ = 8291184552. Its totient is φ = 1578493440.

The previous prime is 3947208329. The next prime is 3947208407. The reversal of 3947208340 is 438027493.

It can be written as a sum of positive squares in 4 ways, for example, as 289136016 + 3658072324 = 17004^2 + 60482^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3947208293 and 3947208302.

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 7 ways as a sum of consecutive naturals, for example, 67000 + ... + 111280.

It is an arithmetic number, because the mean of its divisors is an integer number (345466023).

Almost surely, 2^3947208340 is an apocalyptic number.

It is an amenable number.

3947208340 is an abundant number, since it is smaller than the sum of its proper divisors (4343976212).

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

3947208340 is a wasteful number, since it uses less digits than its factorization.

3947208340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48747 (or 48745 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 3947208340 is about 62826.8122699218. The cubic root of 3947208340 is about 1580.3866409435.

The spelling of 3947208340 in words is "three billion, nine hundred forty-seven million, two hundred eight thousand, three hundred forty".