3721809236 has 12 divisors (see below), whose sum is σ = 6538511028. Its totient is φ = 1853663232.

The previous prime is 3721809233. The next prime is 3721809277. The reversal of 3721809236 is 6329081273.

It can be written as a sum of positive squares in 2 ways, for example, as 3202880836 + 518928400 = 56594^2 + 22780^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 3721809193 and 3721809202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3721809233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1809191 + ... + 1811246.

It is an arithmetic number, because the mean of its divisors is an integer number (544875919).

Almost surely, 2^3721809236 is an apocalyptic number.

It is an amenable number.

3721809236 is a deficient number, since it is larger than the sum of its proper divisors (2816701792).

3721809236 is a wasteful number, since it uses less digits than its factorization.

3721809236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3620698 (or 3620696 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 3721809236 is about 61006.6327213689. The cubic root of 3721809236 is about 1549.7133338742.

The spelling of 3721809236 in words is "three billion, seven hundred twenty-one million, eight hundred nine thousand, two hundred thirty-six".