82181438 has 8 divisors (see below), whose sum is σ = 128631888. Its totient is φ = 39304144.

The previous prime is 82181423. The next prime is 82181453. The reversal of 82181438 is 83418128.

It is an interprime number because it is at equal distance from previous prime (82181423) and next prime (82181453).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 82181398 and 82181407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893231 + ... + 893322.

It is an arithmetic number, because the mean of its divisors is an integer number (16078986).

Almost surely, 2^82181438 is an apocalyptic number.

82181438 is a deficient number, since it is larger than the sum of its proper divisors (46450450).

82181438 is a wasteful number, since it uses less digits than its factorization.

82181438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786578.

The product of its digits is 12288, while the sum is 35.

The square root of 82181438 is about 9065.3978401392. The cubic root of 82181438 is about 434.7683410022.

The spelling of 82181438 in words is "eighty-two million, one hundred eighty-one thousand, four hundred thirty-eight".