823971942 has 12 divisors (see below), whose sum is σ = 1785272580. Its totient is φ = 274657308.

The previous prime is 823971923. The next prime is 823971943. The reversal of 823971942 is 249179328.

It is a super-2 number, since 2×823971942² = 1357859522406502728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823971943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22888092 + ... + 22888127.

It is an arithmetic number, because the mean of its divisors is an integer number (148772715).

Almost surely, 2^823971942 is an apocalyptic number.

823971942 is an abundant number, since it is smaller than the sum of its proper divisors (961300638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

823971942 is a wasteful number, since it uses less digits than its factorization.

823971942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45776227 (or 45776224 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 823971942 is about 28704.9114612813. The cubic root of 823971942 is about 937.4989883722.

The spelling of 823971942 in words is "eight hundred twenty-three million, nine hundred seventy-one thousand, nine hundred forty-two".