3720009 has 8 divisors (see below), whose sum is σ = 5044320. Its totient is φ = 2437856.

The previous prime is 3719999. The next prime is 3720011. The reversal of 3720009 is 9000273.

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 3720009 - 2⁴ = 3719993 is a prime.

It is an Ulam 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, 10332 + ... + 10685.

It is an arithmetic number, because the mean of its divisors is an integer number (630540).

Almost surely, 2^3720009 is an apocalyptic number.

It is an amenable number.

3720009 is a deficient number, since it is larger than the sum of its proper divisors (1324311).

3720009 is a wasteful number, since it uses less digits than its factorization.

3720009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21079.

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 3720009 is about 1928.7324853385. The cubic root of 3720009 is about 154.9463428564.

The spelling of 3720009 in words is "three million, seven hundred twenty thousand, nine".