3909965842 has 4 divisors (see below), whose sum is σ = 5864948766. Its totient is φ = 1954982920.

The previous prime is 3909965821. The next prime is 3909965869. The reversal of 3909965842 is 2485699093.

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., 2073071961 + 1836893881 = 45531^2 + 42859^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977491459 + ... + 977491462.

Almost surely, 2^3909965842 is an apocalyptic number.

3909965842 is a deficient number, since it is larger than the sum of its proper divisors (1954982924).

3909965842 is a wasteful number, since it uses less digits than its factorization.

3909965842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954982923.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The square root of 3909965842 is about 62529.7196699298. The cubic root of 3909965842 is about 1575.4005319793.

The spelling of 3909965842 in words is "three billion, nine hundred nine million, nine hundred sixty-five thousand, eight hundred forty-two".