3997509 has 4 divisors (see below), whose sum is σ = 5330016. Its totient is φ = 2665004.

The previous prime is 3997507. The next prime is 3997547. The reversal of 3997509 is 9057993.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 3997509 - 2¹ = 3997507 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3997507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666249 + ... + 666254.

It is an arithmetic number, because the mean of its divisors is an integer number (1332504).

Almost surely, 2^3997509 is an apocalyptic number.

It is an amenable number.

3997509 is a deficient number, since it is larger than the sum of its proper divisors (1332507).

3997509 is a wasteful number, since it uses less digits than its factorization.

3997509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332506.

The product of its (nonzero) digits is 76545, while the sum is 42.

The square root of 3997509 is about 1999.3771530154. The cubic root of 3997509 is about 158.7071465540.

The spelling of 3997509 in words is "three million, nine hundred ninety-seven thousand, five hundred nine".