82138807 has 2 divisors, whose sum is σ = 82138808. Its totient is φ = 82138806.

The previous prime is 82138787. The next prime is 82138811. The reversal of 82138807 is 70883128.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82138807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82138877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41069403 + 41069404.

It is an arithmetic number, because the mean of its divisors is an integer number (41069404).

Almost surely, 2^82138807 is an apocalyptic number.

82138807 is a deficient number, since it is larger than the sum of its proper divisors (1).

82138807 is an equidigital number, since it uses as much as digits as its factorization.

82138807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 82138807 is about 9063.0462318141. The cubic root of 82138807 is about 434.6931504020.

It can be divided in two parts, 8213 and 8807, that added together give a triangular number (17020 = T₁₈₄).

The spelling of 82138807 in words is "eighty-two million, one hundred thirty-eight thousand, eight hundred seven".