81960942 has 32 divisors (see below), whose sum is σ = 190416384. Its totient is φ = 23032800.

The previous prime is 81960917. The next prime is 81960947. The reversal of 81960942 is 24906918.

It is a self number, because there is not a number n which added to its sum of digits gives 81960942.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81960947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13434 + ... + 18557.

It is an arithmetic number, because the mean of its divisors is an integer number (5950512).

Almost surely, 2^81960942 is an apocalyptic number.

81960942 is an abundant number, since it is smaller than the sum of its proper divisors (108455442).

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

81960942 is a wasteful number, since it uses less digits than its factorization.

81960942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32064.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 81960942 is about 9053.2282639951. The cubic root of 81960942 is about 434.3791592652.

The spelling of 81960942 in words is "eighty-one million, nine hundred sixty thousand, nine hundred forty-two".