81237814 has 8 divisors (see below), whose sum is σ = 139264848. Its totient is φ = 34816200.

The previous prime is 81237811. The next prime is 81237823. The reversal of 81237814 is 41873218.

It is a happy number.

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 81237814.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81237811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2901337 + ... + 2901364.

It is an arithmetic number, because the mean of its divisors is an integer number (17408106).

Almost surely, 2^81237814 is an apocalyptic number.

81237814 is a deficient number, since it is larger than the sum of its proper divisors (58027034).

81237814 is a wasteful number, since it uses less digits than its factorization.

81237814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5802710.

The product of its digits is 10752, while the sum is 34.

The square root of 81237814 is about 9013.2022056537. The cubic root of 81237814 is about 433.0978982755.

The spelling of 81237814 in words is "eighty-one million, two hundred thirty-seven thousand, eight hundred fourteen".