3720865 has 16 divisors (see below), whose sum is σ = 4795200. Its totient is φ = 2763072.

The previous prime is 3720859. The next prime is 3720869. The reversal of 3720865 is 5680273.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3720865 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3720869) 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, 4666 + ... + 5404.

It is an arithmetic number, because the mean of its divisors is an integer number (299700).

Almost surely, 2^3720865 is an apocalyptic number.

It is an amenable number.

3720865 is a deficient number, since it is larger than the sum of its proper divisors (1074335).

3720865 is a wasteful number, since it uses less digits than its factorization.

3720865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 3720865 is about 1928.9543799686. The cubic root of 3720865 is about 154.9582266895.

It can be divided in two parts, 37208 and 65, that added together give a palindrome (37273).

The spelling of 3720865 in words is "three million, seven hundred twenty thousand, eight hundred sixty-five".