3720657 has 4 divisors (see below), whose sum is σ = 4960880. Its totient is φ = 2480436.

The previous prime is 3720649. The next prime is 3720667. The reversal of 3720657 is 7560273.

3720657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3720657 - 2³ = 3720649 is a prime.

It is a D-number.

It is a Duffinian number.

3720657 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3720617) 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 3 ways as a sum of consecutive naturals, for example, 620107 + ... + 620112.

It is an arithmetic number, because the mean of its divisors is an integer number (1240220).

Almost surely, 2^3720657 is an apocalyptic number.

It is an amenable number.

3720657 is a deficient number, since it is larger than the sum of its proper divisors (1240223).

3720657 is a wasteful number, since it uses less digits than its factorization.

3720657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240222.

The product of its (nonzero) digits is 8820, while the sum is 30.

The square root of 3720657 is about 1928.9004639950. The cubic root of 3720657 is about 154.9553391968.

The spelling of 3720657 in words is "three million, seven hundred twenty thousand, six hundred fifty-seven".