81414393 has 16 divisors (see below), whose sum is σ = 112584576. Its totient is φ = 52289280.

The previous prime is 81414349. The next prime is 81414407. The reversal of 81414393 is 39341418.

It is not a de Polignac number, because 81414393 - 2⁶ = 81414329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81410393) 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, 7873 + ... + 14993.

It is an arithmetic number, because the mean of its divisors is an integer number (7036536).

Almost surely, 2^81414393 is an apocalyptic number.

It is an amenable number.

81414393 is a deficient number, since it is larger than the sum of its proper divisors (31170183).

81414393 is a wasteful number, since it uses less digits than its factorization.

81414393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7264.

The product of its digits is 10368, while the sum is 33.

The square root of 81414393 is about 9022.9924637007. The cubic root of 81414393 is about 433.4114659245.

The spelling of 81414393 in words is "eighty-one million, four hundred fourteen thousand, three hundred ninety-three".