3921161800 has 24 divisors (see below), whose sum is σ = 9116701650. Its totient is φ = 1568464640.

The previous prime is 3921161789. The next prime is 3921161851. The reversal of 3921161800 is 81611293.

It can be written as a sum of positive squares in 3 ways, for example, as 3448273284 + 472888516 = 58722^2 + 21746^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9802705 + ... + 9803104.

Almost surely, 2^3921161800 is an apocalyptic number.

It is an amenable number.

3921161800 is an abundant number, since it is smaller than the sum of its proper divisors (5195539850).

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

3921161800 is a wasteful number, since it uses less digits than its factorization.

3921161800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19605825 (or 19605816 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 3921161800 is about 62619.1807675572. The cubic root of 3921161800 is about 1576.9027880426.

The spelling of 3921161800 in words is "three billion, nine hundred twenty-one million, one hundred sixty-one thousand, eight hundred".