3979423666 has 8 divisors (see below), whose sum is σ = 6023898540. Its totient is φ = 1971457488.

The previous prime is 3979423663. The next prime is 3979423673. The reversal of 3979423666 is 6663249793.

It can be written as a sum of positive squares in 2 ways, for example, as 3547989225 + 431434441 = 59565^2 + 20771^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (3979423663) 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, 9126901 + ... + 9127336.

Almost surely, 2^3979423666 is an apocalyptic number.

3979423666 is a deficient number, since it is larger than the sum of its proper divisors (2044474874).

3979423666 is a wasteful number, since it uses less digits than its factorization.

3979423666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18254348.

The product of its digits is 8817984, while the sum is 55.

The square root of 3979423666 is about 63082.6732629492. The cubic root of 3979423666 is about 1584.6744634906.

The spelling of 3979423666 in words is "three billion, nine hundred seventy-nine million, four hundred twenty-three thousand, six hundred sixty-six".