3720661 has 16 divisors (see below), whose sum is σ = 4460544. Its totient is φ = 3037104.

The previous prime is 3720649. The next prime is 3720667. The reversal of 3720661 is 1660273.

It is not a de Polignac number, because 3720661 - 2¹¹ = 3718613 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 (3720667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14016 + ... + 14278.

It is an arithmetic number, because the mean of its divisors is an integer number (278784).

Almost surely, 2^3720661 is an apocalyptic number.

It is an amenable number.

3720661 is a deficient number, since it is larger than the sum of its proper divisors (739883).

3720661 is a wasteful number, since it uses less digits than its factorization.

3720661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 3720661 is about 1928.9015008548. The cubic root of 3720661 is about 154.9553947265.

The spelling of 3720661 in words is "three million, seven hundred twenty thousand, six hundred sixty-one".