3721810005 has 16 divisors (see below), whose sum is σ = 6616551360. Its totient is φ = 1984965264.

The previous prime is 3721809991. The next prime is 3721810063. The reversal of 3721810005 is 5000181273.

It is not a de Polignac number, because 3721810005 - 2¹⁶ = 3721744469 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 15 ways as a sum of consecutive naturals, for example, 13784347 + ... + 13784616.

It is an arithmetic number, because the mean of its divisors is an integer number (413534460).

Almost surely, 2^3721810005 is an apocalyptic number.

It is an amenable number.

3721810005 is a deficient number, since it is larger than the sum of its proper divisors (2894741355).

3721810005 is a wasteful number, since it uses less digits than its factorization.

3721810005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27568977 (or 27568971 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 3721810005 is about 61006.6390239620. The cubic root of 3721810005 is about 1549.7134406081.

Adding to 3721810005 its reverse (5000181273), we get a palindrome (8721991278).

The spelling of 3721810005 in words is "three billion, seven hundred twenty-one million, eight hundred ten thousand, five".