81872343 has 16 divisors (see below), whose sum is σ = 138620160. Its totient is φ = 46784088.

The previous prime is 81872339. The next prime is 81872359. The reversal of 81872343 is 34327818.

It is not a de Polignac number, because 81872343 - 2² = 81872339 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 81872298 and 81872307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81872303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216405 + ... + 216782.

It is an arithmetic number, because the mean of its divisors is an integer number (8663760).

Almost surely, 2^81872343 is an apocalyptic number.

81872343 is a deficient number, since it is larger than the sum of its proper divisors (56747817).

81872343 is a wasteful number, since it uses less digits than its factorization.

81872343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433203 (or 433197 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 81872343 is about 9048.3337140050. Note that the first 3 decimals coincide. The cubic root of 81872343 is about 434.2225829171. Note that the first 3 decimals are identical.

It can be divided in two parts, 81872 and 343, that added together give a triangular number (82215 = T₄₀₅).

The spelling of 81872343 in words is "eighty-one million, eight hundred seventy-two thousand, three hundred forty-three".