3720509 has 8 divisors (see below), whose sum is σ = 4037880. Its totient is φ = 3407616.

The previous prime is 3720491. The next prime is 3720511. The reversal of 3720509 is 9050273.

It can be written as a sum of positive squares in 4 ways, for example, as 727609 + 2992900 = 853^2 + 1730^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3720509 - 2⁸ = 3720253 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 (3720209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737 + ... + 2825.

It is an arithmetic number, because the mean of its divisors is an integer number (504735).

Almost surely, 2^3720509 is an apocalyptic number.

It is an amenable number.

3720509 is a deficient number, since it is larger than the sum of its proper divisors (317371).

3720509 is a wasteful number, since it uses less digits than its factorization.

3720509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2239.

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 3720509 is about 1928.8620997884. The cubic root of 3720509 is about 154.9532845691.

The spelling of 3720509 in words is "three million, seven hundred twenty thousand, five hundred nine".