81902 has 8 divisors (see below), whose sum is σ = 126912. Its totient is φ = 39600.

The previous prime is 81901. The next prime is 81919. The reversal of 81902 is 20918.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81901) 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, 599 + ... + 722.

It is an arithmetic number, because the mean of its divisors is an integer number (15864).

2⁸¹⁹⁰² is an apocalyptic number.

81902 is a deficient number, since it is larger than the sum of its proper divisors (45010).

81902 is a wasteful number, since it uses less digits than its factorization.

81902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 81902 is about 286.1852546865. The cubic root of 81902 is about 43.4275006744.

It can be divided in two parts, 8190 and 2, that added together give a 13-th power (8192 = 2¹³).

The spelling of 81902 in words is "eighty-one thousand, nine hundred two".