971664394 has 16 divisors (see below), whose sum is σ = 1542291840. Its totient is φ = 458162320.

The previous prime is 971664391. The next prime is 971664413. The reversal of 971664394 is 493466179.

971664394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (971664391) 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, 145489 + ... + 152020.

It is an arithmetic number, because the mean of its divisors is an integer number (96393240).

Almost surely, 2^971664394 is an apocalyptic number.

971664394 is a deficient number, since it is larger than the sum of its proper divisors (570627446).

971664394 is a wasteful number, since it uses less digits than its factorization.

971664394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297605.

The product of its digits is 979776, while the sum is 49.

The square root of 971664394 is about 31171.5317878349. The cubic root of 971664394 is about 990.4641546932.

The spelling of 971664394 in words is "nine hundred seventy-one million, six hundred sixty-four thousand, three hundred ninety-four".