3691447979 has 4 divisors (see below), whose sum is σ = 3704774784. Its totient is φ = 3678121176.

The previous prime is 3691447967. The next prime is 3691447987. The reversal of 3691447979 is 9797441963.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9797441963 = 29231 ⋅335173.

It is a cyclic number.

It is not a de Polignac number, because 3691447979 - 2⁸ = 3691447723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3691447939) 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, 6662987 + ... + 6663540.

It is an arithmetic number, because the mean of its divisors is an integer number (926193696).

Almost surely, 2^3691447979 is an apocalyptic number.

3691447979 is a deficient number, since it is larger than the sum of its proper divisors (13326805).

3691447979 is a wasteful number, since it uses less digits than its factorization.

3691447979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13326804.

The product of its digits is 10287648, while the sum is 59.

The square root of 3691447979 is about 60757.2874559094. The cubic root of 3691447979 is about 1545.4878109699.

The spelling of 3691447979 in words is "three billion, six hundred ninety-one million, four hundred forty-seven thousand, nine hundred seventy-nine".