394667636471 has 4 divisors (see below), whose sum is σ = 395838757392. Its totient is φ = 393496515552.

The previous prime is 394667636453. The next prime is 394667636477. The reversal of 394667636471 is 174636766493.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 394667636471 - 2²² = 394663442167 is a prime.

It is a super-3 number, since 3×394667636471³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394667636477) 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, 585559955 + ... + 585560628.

It is an arithmetic number, because the mean of its divisors is an integer number (98959689348).

Almost surely, 2^394667636471 is an apocalyptic number.

394667636471 is a deficient number, since it is larger than the sum of its proper divisors (1171120921).

394667636471 is a wasteful number, since it uses less digits than its factorization.

394667636471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171120920.

The product of its digits is 82301184, while the sum is 62.

The spelling of 394667636471 in words is "three hundred ninety-four billion, six hundred sixty-seven million, six hundred thirty-six thousand, four hundred seventy-one".