81914838 has 16 divisors (see below), whose sum is σ = 165452976. Its totient is φ = 27034400.

The previous prime is 81914831. The next prime is 81914849. The reversal of 81914838 is 83841918.

It is a self number, because there is not a number n which added to its sum of digits gives 81914838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81914831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66981 + ... + 68192.

It is an arithmetic number, because the mean of its divisors is an integer number (10340811).

Almost surely, 2^81914838 is an apocalyptic number.

81914838 is an abundant number, since it is smaller than the sum of its proper divisors (83538138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81914838 is a wasteful number, since it uses less digits than its factorization.

81914838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135279.

The product of its digits is 55296, while the sum is 42.

The square root of 81914838 is about 9050.6816317888. The cubic root of 81914838 is about 434.2976961825.

The spelling of 81914838 in words is "eighty-one million, nine hundred fourteen thousand, eight hundred thirty-eight".