81983342 has 16 divisors (see below), whose sum is σ = 144342240. Its totient is φ = 34185888.

The previous prime is 81983303. The next prime is 81983357. The reversal of 81983342 is 24338918.

It is a junction number, because it is equal to n+sod(n) for n = 81983296 and 81983305.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 78617 + ... + 79652.

It is an arithmetic number, because the mean of its divisors is an integer number (9021390).

Almost surely, 2^81983342 is an apocalyptic number.

81983342 is a deficient number, since it is larger than the sum of its proper divisors (62358898).

81983342 is a wasteful number, since it uses less digits than its factorization.

81983342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158315.

The product of its digits is 41472, while the sum is 38.

The square root of 81983342 is about 9054.4653072393. The cubic root of 81983342 is about 434.4187277339.

The spelling of 81983342 in words is "eighty-one million, nine hundred eighty-three thousand, three hundred forty-two".