3909195842 has 4 divisors (see below), whose sum is σ = 5863793766. Its totient is φ = 1954597920.

The previous prime is 3909195811. The next prime is 3909195847. The reversal of 3909195842 is 2485919093.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3150689161 + 758506681 = 56131^2 + 27541^2 .

It is a super-2 number, since 2×3909195842² = 30563624262220177928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3909195847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977298959 + ... + 977298962.

Almost surely, 2^3909195842 is an apocalyptic number.

3909195842 is a deficient number, since it is larger than the sum of its proper divisors (1954597924).

3909195842 is a wasteful number, since it uses less digits than its factorization.

3909195842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954597923.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 3909195842 is about 62523.5622945462. The cubic root of 3909195842 is about 1575.2971092473.

The spelling of 3909195842 in words is "three billion, nine hundred nine million, one hundred ninety-five thousand, eight hundred forty-two".