3720987509 has 16 divisors (see below), whose sum is σ = 3891379968. Its totient is φ = 3555374592.

The previous prime is 3720987481. The next prime is 3720987539. The reversal of 3720987509 is 9057890273.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 3720987509 - 2²⁰ = 3719938933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3720987539) 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 15 ways as a sum of consecutive naturals, for example, 350609 + ... + 361065.

It is an arithmetic number, because the mean of its divisors is an integer number (243211248).

Almost surely, 2^3720987509 is an apocalyptic number.

It is an amenable number.

3720987509 is a deficient number, since it is larger than the sum of its proper divisors (170392459).

3720987509 is a wasteful number, since it uses less digits than its factorization.

3720987509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10684.

The product of its (nonzero) digits is 952560, while the sum is 50.

The square root of 3720987509 is about 60999.8976146682. The cubic root of 3720987509 is about 1549.5992733068.

The spelling of 3720987509 in words is "three billion, seven hundred twenty million, nine hundred eighty-seven thousand, five hundred nine".