138782805 has 32 divisors (see below), whose sum is σ = 264812544. Its totient is φ = 60684096.

The previous prime is 138782803. The next prime is 138782807. The reversal of 138782805 is 508287831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (138782803) and next prime (138782807).

It is not a de Polignac number, because 138782805 - 2¹ = 138782803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138782803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26319 + ... + 31148.

It is an arithmetic number, because the mean of its divisors is an integer number (8275392).

Almost surely, 2^138782805 is an apocalyptic number.

138782805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138782805 is a deficient number, since it is larger than the sum of its proper divisors (126029739).

138782805 is a wasteful number, since it uses less digits than its factorization.

138782805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57505.

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 138782805 is about 11780.6114017907. The cubic root of 138782805 is about 517.7401998188.

The spelling of 138782805 in words is "one hundred thirty-eight million, seven hundred eighty-two thousand, eight hundred five".