3967397691 has 8 divisors (see below), whose sum is σ = 5291036160. Its totient is φ = 2644345512.

The previous prime is 3967397689. The next prime is 3967397713. The reversal of 3967397691 is 1967937693.

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

It is not a de Polignac number, because 3967397691 - 2¹ = 3967397689 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (3967397641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130531 + ... + 158028.

It is an arithmetic number, because the mean of its divisors is an integer number (661379520).

Almost surely, 2^3967397691 is an apocalyptic number.

3967397691 is a deficient number, since it is larger than the sum of its proper divisors (1323638469).

3967397691 is a wasteful number, since it uses less digits than its factorization.

3967397691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293145.

The product of its digits is 11573604, while the sum is 60.

The square root of 3967397691 is about 62987.2819781899. The cubic root of 3967397691 is about 1583.0765365346.

The spelling of 3967397691 in words is "three billion, nine hundred sixty-seven million, three hundred ninety-seven thousand, six hundred ninety-one".