3944938909 has 4 divisors (see below), whose sum is σ = 4116458016. Its totient is φ = 3773419804.

The previous prime is 3944938867. The next prime is 3944938913. The reversal of 3944938909 is 9098394493.

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 3944938909 - 2⁹ = 3944938397 is a prime.

It is a super-2 number, since 2×3944938909² = 31125085991484220562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3944938939) 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, 85759519 + ... + 85759564.

It is an arithmetic number, because the mean of its divisors is an integer number (1029114504).

Almost surely, 2^3944938909 is an apocalyptic number.

It is an amenable number.

3944938909 is a deficient number, since it is larger than the sum of its proper divisors (171519107).

3944938909 is a wasteful number, since it uses less digits than its factorization.

3944938909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171519106.

The product of its (nonzero) digits is 7558272, while the sum is 58.

The square root of 3944938909 is about 62808.7486660895. The cubic root of 3944938909 is about 1580.0837039723.

The spelling of 3944938909 in words is "three billion, nine hundred forty-four million, nine hundred thirty-eight thousand, nine hundred nine".