138481406 has 16 divisors (see below), whose sum is σ = 237549024. Its totient is φ = 59311104.

The previous prime is 138481397. The next prime is 138481423. The reversal of 138481406 is 604184831.

It is a congruent number.

It is an unprimeable number.

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, 36746 + ... + 40338.

It is an arithmetic number, because the mean of its divisors is an integer number (14846814).

Almost surely, 2^138481406 is an apocalyptic number.

138481406 is a deficient number, since it is larger than the sum of its proper divisors (99067618).

138481406 is a wasteful number, since it uses less digits than its factorization.

138481406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6355.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 138481406 is about 11767.8122860624. The cubic root of 138481406 is about 517.3651305908.

The spelling of 138481406 in words is "one hundred thirty-eight million, four hundred eighty-one thousand, four hundred six".