81830403 has 12 divisors (see below), whose sum is σ = 118438320. Its totient is φ = 54443376.

The previous prime is 81830377. The next prime is 81830423. The reversal of 81830403 is 30403818.

It is not a de Polignac number, because 81830403 - 2⁶ = 81830339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81830423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4351 + ... + 13512.

It is an arithmetic number, because the mean of its divisors is an integer number (9869860).

Almost surely, 2^81830403 is an apocalyptic number.

81830403 is a deficient number, since it is larger than the sum of its proper divisors (36607917).

81830403 is a wasteful number, since it uses less digits than its factorization.

81830403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18378 (or 18375 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 81830403 is about 9046.0158633511. The cubic root of 81830403 is about 434.1484251694.

The spelling of 81830403 in words is "eighty-one million, eight hundred thirty thousand, four hundred three".