138465481 has 8 divisors (see below), whose sum is σ = 172632384. Its totient is φ = 107895120.

The previous prime is 138465479. The next prime is 138465511. The reversal of 138465481 is 184564831.

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

It is a cyclic number.

It is not a de Polignac number, because 138465481 - 2¹ = 138465479 is a prime.

It is a super-2 number, since 2×138465481² = 38345378857122722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138465421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 899050 + ... + 899203.

It is an arithmetic number, because the mean of its divisors is an integer number (21579048).

Almost surely, 2^138465481 is an apocalyptic number.

138465481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

138465481 is a deficient number, since it is larger than the sum of its proper divisors (34166903).

138465481 is a wasteful number, since it uses less digits than its factorization.

138465481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798271.

The product of its digits is 92160, while the sum is 40.

The square root of 138465481 is about 11767.1356327698. The cubic root of 138465481 is about 517.3452979510.

The spelling of 138465481 in words is "one hundred thirty-eight million, four hundred sixty-five thousand, four hundred eighty-one".