82156442 has 4 divisors (see below), whose sum is σ = 123234666. Its totient is φ = 41078220.

The previous prime is 82156441. The next prime is 82156469. The reversal of 82156442 is 24465128.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 80442961 + 1713481 = 8969^2 + 1309^2 .

It is a junction number, because it is equal to n+sod(n) for n = 82156399 and 82156408.

It is not an unprimeable number, because it can be changed into a prime (82156441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20539109 + ... + 20539112.

Almost surely, 2^82156442 is an apocalyptic number.

82156442 is a deficient number, since it is larger than the sum of its proper divisors (41078224).

82156442 is a wasteful number, since it uses less digits than its factorization.

82156442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41078223.

The product of its digits is 15360, while the sum is 32.

The square root of 82156442 is about 9064.0190864759. The cubic root of 82156442 is about 434.7242573596.

The spelling of 82156442 in words is "eighty-two million, one hundred fifty-six thousand, four hundred forty-two".