3945921874 has 4 divisors (see below), whose sum is σ = 5918882814. Its totient is φ = 1972960936.

The previous prime is 3945921857. The next prime is 3945921899. The reversal of 3945921874 is 4781295493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4781295493 = 13 ⋅367791961.

It can be written as a sum of positive squares in only one way, i.e., 3655048849 + 290873025 = 60457^2 + 17055^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986480467 + ... + 986480470.

Almost surely, 2^3945921874 is an apocalyptic number.

3945921874 is a deficient number, since it is larger than the sum of its proper divisors (1972960940).

3945921874 is a wasteful number, since it uses less digits than its factorization.

3945921874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972960939.

The product of its digits is 2177280, while the sum is 52.

The square root of 3945921874 is about 62816.5732430543. The cubic root of 3945921874 is about 1580.2149301696.

The spelling of 3945921874 in words is "three billion, nine hundred forty-five million, nine hundred twenty-one thousand, eight hundred seventy-four".