3945009509 has 16 divisors (see below), whose sum is σ = 4556648448. Its totient is φ = 3345535872.

The previous prime is 3945009499. The next prime is 3945009517. The reversal of 3945009509 is 9059005493.

It is a de Polignac number, because none of the positive numbers 2^k-3945009509 is a prime.

It is a super-2 number, since 2×3945009509² = 31126200052200842162, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3945009509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945009559) 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, 325649 + ... + 337545.

It is an arithmetic number, because the mean of its divisors is an integer number (284790528).

Almost surely, 2^3945009509 is an apocalyptic number.

It is an amenable number.

3945009509 is a deficient number, since it is larger than the sum of its proper divisors (611638939).

3945009509 is a wasteful number, since it uses less digits than its factorization.

3945009509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12404.

The product of its (nonzero) digits is 218700, while the sum is 44.

The square root of 3945009509 is about 62809.3106871903. The cubic root of 3945009509 is about 1580.0931298254.

The spelling of 3945009509 in words is "three billion, nine hundred forty-five million, nine thousand, five hundred nine".