81203986 has 16 divisors (see below), whose sum is σ = 128763360. Its totient is φ = 38301120.

The previous prime is 81203981. The next prime is 81203989. The reversal of 81203986 is 68930218.

It is not an unprimeable number, because it can be changed into a prime (81203981) 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, 4725 + ... + 13591.

It is an arithmetic number, because the mean of its divisors is an integer number (8047710).

Almost surely, 2^81203986 is an apocalyptic number.

81203986 is a deficient number, since it is larger than the sum of its proper divisors (47559374).

81203986 is a wasteful number, since it uses less digits than its factorization.

81203986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9129.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 81203986 is about 9011.3254297023. The cubic root of 81203986 is about 433.0377749207.

The spelling of 81203986 in words is "eighty-one million, two hundred three thousand, nine hundred eighty-six".