3999803537 has 8 divisors (see below), whose sum is σ = 4235665896. Its totient is φ = 3764005632.

The previous prime is 3999803519. The next prime is 3999803543. The reversal of 3999803537 is 7353089993.

It is a Cunningham number, because it is equal to 63244²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 379456 + 3999424081 = 616^2 + 63241^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3999803537 - 2⁸ = 3999803281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3999803567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179843 + ... + 200855.

It is an arithmetic number, because the mean of its divisors is an integer number (529458237).

Almost surely, 2^3999803537 is an apocalyptic number.

It is an amenable number.

3999803537 is a deficient number, since it is larger than the sum of its proper divisors (235862359).

3999803537 is a wasteful number, since it uses less digits than its factorization.

3999803537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32227.

The product of its (nonzero) digits is 5511240, while the sum is 56.

The square root of 3999803537 is about 63244.0000079059. Note that the first 5 decimals coincide. The cubic root of 3999803537 is about 1587.3750627450.

The spelling of 3999803537 in words is "three billion, nine hundred ninety-nine million, eight hundred three thousand, five hundred thirty-seven".