81400532 has 12 divisors (see below), whose sum is σ = 143048640. Its totient is φ = 40529496.

The previous prime is 81400531. The next prime is 81400547. The reversal of 81400532 is 23500418.

It is a junction number, because it is equal to n+sod(n) for n = 81400498 and 81400507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81400531) 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, 41618 + ... + 43529.

It is an arithmetic number, because the mean of its divisors is an integer number (11920720).

Almost surely, 2^81400532 is an apocalyptic number.

It is an amenable number.

81400532 is a deficient number, since it is larger than the sum of its proper divisors (61648108).

81400532 is a wasteful number, since it uses less digits than its factorization.

81400532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85390 (or 85388 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 81400532 is about 9022.2243377118. The cubic root of 81400532 is about 433.3868680737.

The spelling of 81400532 in words is "eighty-one million, four hundred thousand, five hundred thirty-two".