138077481 has 8 divisors (see below), whose sum is σ = 184783744. Its totient is φ = 91711440.

The previous prime is 138077477. The next prime is 138077483. The reversal of 138077481 is 184770831.

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

It is not a de Polignac number, because 138077481 - 2² = 138077477 is a prime.

It is a super-2 number, since 2×138077481² = 38130781518610722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138077483) 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 7 ways as a sum of consecutive naturals, for example, 84106 + ... + 85731.

It is an arithmetic number, because the mean of its divisors is an integer number (23097968).

Almost surely, 2^138077481 is an apocalyptic number.

It is an amenable number.

138077481 is a deficient number, since it is larger than the sum of its proper divisors (46706263).

138077481 is a wasteful number, since it uses less digits than its factorization.

138077481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170111.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 138077481 is about 11750.6374720693. The cubic root of 138077481 is about 516.8616208210.

The spelling of 138077481 in words is "one hundred thirty-eight million, seventy-seven thousand, four hundred eighty-one".