3640509 has 24 divisors (see below), whose sum is σ = 5628480. Its totient is φ = 2261952.

The previous prime is 3640493. The next prime is 3640519. The reversal of 3640509 is 9050463.

It is a happy number.

It is not a de Polignac number, because 3640509 - 2⁴ = 3640493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640519) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8697 + ... + 9105.

It is an arithmetic number, because the mean of its divisors is an integer number (234520).

Almost surely, 2^3640509 is an apocalyptic number.

It is an amenable number.

3640509 is a deficient number, since it is larger than the sum of its proper divisors (1987971).

3640509 is a wasteful number, since it uses less digits than its factorization.

3640509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 3640509 is about 1908.0117924164. The cubic root of 3640509 is about 153.8346034469.

The spelling of 3640509 in words is "three million, six hundred forty thousand, five hundred nine".