82187438 has 4 divisors (see below), whose sum is σ = 123281160. Its totient is φ = 41093718.

The previous prime is 82187431. The next prime is 82187447. The reversal of 82187438 is 83478128.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 82187395 and 82187404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82187431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20546858 + ... + 20546861.

It is an arithmetic number, because the mean of its divisors is an integer number (30820290).

Almost surely, 2^82187438 is an apocalyptic number.

82187438 is a deficient number, since it is larger than the sum of its proper divisors (41093722).

82187438 is a wasteful number, since it uses less digits than its factorization.

82187438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41093721.

The product of its digits is 86016, while the sum is 41.

The square root of 82187438 is about 9065.7287627636. The cubic root of 82187438 is about 434.7789214392.

The spelling of 82187438 in words is "eighty-two million, one hundred eighty-seven thousand, four hundred thirty-eight".