831639072406 has 4 divisors (see below), whose sum is σ = 1247458608612. Its totient is φ = 415819536202.

The previous prime is 831639072391. The next prime is 831639072457. The reversal of 831639072406 is 604270936138.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604270936138 = 2 ⋅302135468069.

It is a super-2 number, since 2×831639072406² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 831639072406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207909768100 + ... + 207909768103.

It is an arithmetic number, because the mean of its divisors is an integer number (311864652153).

Almost surely, 2^831639072406 is an apocalyptic number.

831639072406 is a deficient number, since it is larger than the sum of its proper divisors (415819536206).

831639072406 is a wasteful number, since it uses less digits than its factorization.

831639072406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415819536205.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The spelling of 831639072406 in words is "eight hundred thirty-one billion, six hundred thirty-nine million, seventy-two thousand, four hundred six".