81942232 has 16 divisors (see below), whose sum is σ = 153755640. Its totient is φ = 40940736.

The previous prime is 81942229. The next prime is 81942239. The reversal of 81942232 is 23224918.

It is a super-3 number, since 3×81942232³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81942194 and 81942203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81942239) 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 3 ways as a sum of consecutive naturals, for example, 11103 + ... + 16945.

Almost surely, 2^81942232 is an apocalyptic number.

It is an amenable number.

81942232 is a deficient number, since it is larger than the sum of its proper divisors (71813408).

81942232 is a wasteful number, since it uses less digits than its factorization.

81942232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7602 (or 7598 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 81942232 is about 9052.1948719634. The cubic root of 81942232 is about 434.3461034691.

The spelling of 81942232 in words is "eighty-one million, nine hundred forty-two thousand, two hundred thirty-two".