81402223 has 16 divisors (see below), whose sum is σ = 95224896. Its totient is φ = 68140800.

The previous prime is 81402203. The next prime is 81402229. The reversal of 81402223 is 32220418.

It is not a de Polignac number, because 81402223 - 2²¹ = 79305071 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81402194 and 81402203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81402229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115773 + ... + 116473.

It is an arithmetic number, because the mean of its divisors is an integer number (5951556).

Almost surely, 2^81402223 is an apocalyptic number.

81402223 is a deficient number, since it is larger than the sum of its proper divisors (13822673).

81402223 is a wasteful number, since it uses less digits than its factorization.

81402223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 81402223 is about 9022.3180502574. The cubic root of 81402223 is about 433.3898690865.

The spelling of 81402223 in words is "eighty-one million, four hundred two thousand, two hundred twenty-three".