81400014 has 12 divisors (see below), whose sum is σ = 176366736. Its totient is φ = 27133332.

The previous prime is 81400003. The next prime is 81400021. The reversal of 81400014 is 41000418.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 4522223 = 81400014 / (8 + 1 + 4 + 0 + 0 + 0 + 1 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 81400014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2261094 + ... + 2261129.

It is an arithmetic number, because the mean of its divisors is an integer number (14697228).

Almost surely, 2^81400014 is an apocalyptic number.

81400014 is an abundant number, since it is smaller than the sum of its proper divisors (94966722).

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

81400014 is a wasteful number, since it uses less digits than its factorization.

81400014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4522231 (or 4522228 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 81400014 is about 9022.1956307764. The cubic root of 81400014 is about 433.3859487722.

The spelling of 81400014 in words is "eighty-one million, four hundred thousand, fourteen".