81389014 has 32 divisors (see below), whose sum is σ = 143067456. Its totient is φ = 34007040.

The previous prime is 81388961. The next prime is 81389017. The reversal of 81389014 is 41098318.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81389017) 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, 98724 + ... + 99544.

It is an arithmetic number, because the mean of its divisors is an integer number (4470858).

Almost surely, 2^81389014 is an apocalyptic number.

81389014 is a deficient number, since it is larger than the sum of its proper divisors (61678442).

81389014 is a wasteful number, since it uses less digits than its factorization.

81389014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 81389014 is about 9021.5860024721. The cubic root of 81389014 is about 433.3664260066.

The spelling of 81389014 in words is "eighty-one million, three hundred eighty-nine thousand, fourteen".