81942395 has 8 divisors (see below), whose sum is σ = 100729440. Its totient is φ = 63954880.

The previous prime is 81942379. The next prime is 81942437. The reversal of 81942395 is 59324918.

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

It is not a de Polignac number, because 81942395 - 2⁴ = 81942379 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199655 + ... + 200064.

It is an arithmetic number, because the mean of its divisors is an integer number (12591180).

Almost surely, 2^81942395 is an apocalyptic number.

81942395 is a deficient number, since it is larger than the sum of its proper divisors (18787045).

81942395 is a wasteful number, since it uses less digits than its factorization.

81942395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399765.

The product of its digits is 77760, while the sum is 41.

The square root of 81942395 is about 9052.2038753002. The cubic root of 81942395 is about 434.3463914702.

The spelling of 81942395 in words is "eighty-one million, nine hundred forty-two thousand, three hundred ninety-five".