81443922 has 16 divisors (see below), whose sum is σ = 186157632. Its totient is φ = 23269680.

The previous prime is 81443911. The next prime is 81443939. The reversal of 81443922 is 22934418.

It is a super-2 number, since 2×81443922² = 13266224861484168, which contains 22 as substring.

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, 969529 + ... + 969612.

It is an arithmetic number, because the mean of its divisors is an integer number (11634852).

Almost surely, 2^81443922 is an apocalyptic number.

81443922 is an abundant number, since it is smaller than the sum of its proper divisors (104713710).

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

81443922 is a wasteful number, since it uses less digits than its factorization.

81443922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939153.

The product of its digits is 13824, while the sum is 33.

The square root of 81443922 is about 9024.6286350187. The cubic root of 81443922 is about 433.4638590363.

The spelling of 81443922 in words is "eighty-one million, four hundred forty-three thousand, nine hundred twenty-two".