138784481 has 16 divisors (see below), whose sum is σ = 162580608. Its totient is φ = 117062400.

The previous prime is 138784463. The next prime is 138784487. The reversal of 138784481 is 184487831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138784481 is a prime.

It is a super-2 number, since 2×138784481² = 38522264332878722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138784487) 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 in 15 ways as a sum of consecutive naturals, for example, 8051 + ... + 18503.

It is an arithmetic number, because the mean of its divisors is an integer number (10161288).

Almost surely, 2^138784481 is an apocalyptic number.

138784481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

138784481 is a deficient number, since it is larger than the sum of its proper divisors (23796127).

138784481 is a wasteful number, since it uses less digits than its factorization.

138784481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10552.

The product of its digits is 172032, while the sum is 44.

The square root of 138784481 is about 11780.6825354052. The cubic root of 138784481 is about 517.7422839605.

The spelling of 138784481 in words is "one hundred thirty-eight million, seven hundred eighty-four thousand, four hundred eighty-one".