81854338 has 8 divisors (see below), whose sum is σ = 124511040. Its totient is φ = 40350660.

The previous prime is 81854321. The next prime is 81854407. The reversal of 81854338 is 83345818.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81854338.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288078 + ... + 288361.

It is an arithmetic number, because the mean of its divisors is an integer number (15563880).

Almost surely, 2^81854338 is an apocalyptic number.

81854338 is a deficient number, since it is larger than the sum of its proper divisors (42656702).

81854338 is a wasteful number, since it uses less digits than its factorization.

81854338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576512.

The product of its digits is 92160, while the sum is 40.

The square root of 81854338 is about 9047.3387247301. The cubic root of 81854338 is about 434.1907498198.

The spelling of 81854338 in words is "eighty-one million, eight hundred fifty-four thousand, three hundred thirty-eight".