81942234 has 16 divisors (see below), whose sum is σ = 178783200. Its totient is φ = 24830960.

The previous prime is 81942229. The next prime is 81942239. The reversal of 81942234 is 43224918.

It is an interprime number because it is at equal distance from previous prime (81942229) and next prime (81942239).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 81942195 and 81942204.

It is not an unprimeable number, because it can be changed into a prime (81942239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 620709 + ... + 620840.

It is an arithmetic number, because the mean of its divisors is an integer number (11173950).

Almost surely, 2^81942234 is an apocalyptic number.

81942234 is an abundant number, since it is smaller than the sum of its proper divisors (96840966).

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

81942234 is a wasteful number, since it uses less digits than its factorization.

81942234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241565.

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

The square root of 81942234 is about 9052.1949824338. The cubic root of 81942234 is about 434.3461070028.

The spelling of 81942234 in words is "eighty-one million, nine hundred forty-two thousand, two hundred thirty-four".