81914430 has 32 divisors (see below), whose sum is σ = 211718304. Its totient is φ = 20163456.

The previous prime is 81914419. The next prime is 81914461. The reversal of 81914430 is 3441918.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104629 + ... + 105408.

It is an arithmetic number, because the mean of its divisors is an integer number (6616197).

Almost surely, 2^81914430 is an apocalyptic number.

81914430 is an abundant number, since it is smaller than the sum of its proper divisors (129803874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81914430 is a wasteful number, since it uses less digits than its factorization.

81914430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210060.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 81914430 is about 9050.6590920220. The cubic root of 81914430 is about 434.2969751338.

It can be divided in two parts, 8191 and 4430, that added together give a palindrome (12621).

The spelling of 81914430 in words is "eighty-one million, nine hundred fourteen thousand, four hundred thirty".