3720649 has 2 divisors, whose sum is σ = 3720650. Its totient is φ = 3720648.

The previous prime is 3720623. The next prime is 3720667. The reversal of 3720649 is 9460273.

3720649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2082249 + 1638400 = 1443^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 3720649 - 2⁵ = 3720617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3720649.

It is not a weakly prime, because it can be changed into another prime (3720349) 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 as a sum of consecutive naturals, namely, 1860324 + 1860325.

It is an arithmetic number, because the mean of its divisors is an integer number (1860325).

Almost surely, 2^3720649 is an apocalyptic number.

It is an amenable number.

3720649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3720649 is an equidigital number, since it uses as much as digits as its factorization.

3720649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 3720649 is about 1928.8983902736. The cubic root of 3720649 is about 154.9552281372.

The spelling of 3720649 in words is "three million, seven hundred twenty thousand, six hundred forty-nine".