3720645 has 24 divisors (see below), whose sum is σ = 6528600. Its totient is φ = 1959936.

The previous prime is 3720623. The next prime is 3720649. The reversal of 3720645 is 5460273.

It is a happy number.

3720645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 103041 + 3617604 = 321^2 + 1902^2 .

It is not a de Polignac number, because 3720645 - 2⁶ = 3720581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3720649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3541 + ... + 4469.

It is an arithmetic number, because the mean of its divisors is an integer number (272025).

Almost surely, 2^3720645 is an apocalyptic number.

It is an amenable number.

3720645 is a deficient number, since it is larger than the sum of its proper divisors (2807955).

3720645 is a wasteful number, since it uses less digits than its factorization.

3720645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029 (or 1026 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 3720645 is about 1928.8973534120. The cubic root of 3720645 is about 154.9551726074.

The spelling of 3720645 in words is "three million, seven hundred twenty thousand, six hundred forty-five".