82039981 has 8 divisors (see below), whose sum is σ = 85562624. Its totient is φ = 78572160.

The previous prime is 82039963. The next prime is 82039987. The reversal of 82039981 is 18993028.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82039981 - 2²³ = 73651373 is a prime.

It is a super-2 number, since 2×82039981² = 13461116964960722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82039987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10635 + ... + 16648.

It is an arithmetic number, because the mean of its divisors is an integer number (10695328).

Almost surely, 2^82039981 is an apocalyptic number.

It is an amenable number.

82039981 is a deficient number, since it is larger than the sum of its proper divisors (3522643).

82039981 is a wasteful number, since it uses less digits than its factorization.

82039981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27411.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 82039981 is about 9057.5924505356. The cubic root of 82039981 is about 434.5187455248.

The spelling of 82039981 in words is "eighty-two million, thirty-nine thousand, nine hundred eighty-one".