3721005999 has 32 divisors (see below), whose sum is σ = 5857056000. Its totient is φ = 2328111072.

The previous prime is 3721005983. The next prime is 3721006021. The reversal of 3721005999 is 9995001273.

It is a happy number.

3721005999 is a `hidden beast` number, since 37 + 21 + 0 + 0 + 599 + 9 = 666.

It is not a de Polignac number, because 3721005999 - 2⁴ = 3721005983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3721005929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20997 + ... + 88785.

It is an arithmetic number, because the mean of its divisors is an integer number (183033000).

Almost surely, 2^3721005999 is an apocalyptic number.

3721005999 is a deficient number, since it is larger than the sum of its proper divisors (2136050001).

3721005999 is a wasteful number, since it uses less digits than its factorization.

3721005999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67924 (or 67918 counting only the distinct ones).

The product of its (nonzero) digits is 153090, while the sum is 45.

The square root of 3721005999 is about 61000.0491721113. The cubic root of 3721005999 is about 1549.6018400128.

The spelling of 3721005999 in words is "three billion, seven hundred twenty-one million, five thousand, nine hundred ninety-nine".