81408934 has 8 divisors (see below), whose sum is σ = 123299280. Its totient is φ = 40309176.

The previous prime is 81408911. The next prime is 81408949. The reversal of 81408934 is 43980418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 81408893 and 81408902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197389 + ... + 197800.

It is an arithmetic number, because the mean of its divisors is an integer number (15412410).

Almost surely, 2^81408934 is an apocalyptic number.

81408934 is a deficient number, since it is larger than the sum of its proper divisors (41890346).

81408934 is a wasteful number, since it uses less digits than its factorization.

81408934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395294.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 81408934 is about 9022.6899536668. The cubic root of 81408934 is about 433.4017786690.

The spelling of 81408934 in words is "eighty-one million, four hundred eight thousand, nine hundred thirty-four".