81403834 has 16 divisors (see below), whose sum is σ = 124480800. Its totient is φ = 39913744.

The previous prime is 81403807. The next prime is 81403849. The reversal of 81403834 is 43830418.

It is a junction number, because it is equal to n+sod(n) for n = 81403796 and 81403805.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79377 + ... + 80395.

It is an arithmetic number, because the mean of its divisors is an integer number (7780050).

Almost surely, 2^81403834 is an apocalyptic number.

81403834 is a deficient number, since it is larger than the sum of its proper divisors (43076966).

81403834 is a wasteful number, since it uses less digits than its factorization.

81403834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1757.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 81403834 is about 9022.4073284240. The cubic root of 81403834 is about 433.3927280849.

The spelling of 81403834 in words is "eighty-one million, four hundred three thousand, eight hundred thirty-four".