81853430 has 16 divisors (see below), whose sum is σ = 148796784. Its totient is φ = 32416800.

The previous prime is 81853417. The next prime is 81853433. The reversal of 81853430 is 3435818.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81853433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39512 + ... + 41531.

It is an arithmetic number, because the mean of its divisors is an integer number (9299799).

Almost surely, 2^81853430 is an apocalyptic number.

81853430 is a deficient number, since it is larger than the sum of its proper divisors (66943354).

81853430 is a wasteful number, since it uses less digits than its factorization.

81853430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81151.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 81853430 is about 9047.2885440888. The cubic root of 81853430 is about 434.1891443391.

The spelling of 81853430 in words is "eighty-one million, eight hundred fifty-three thousand, four hundred thirty".