138481550 has 12 divisors (see below), whose sum is σ = 257575776. Its totient is φ = 55392600.

The previous prime is 138481531. The next prime is 138481573. The reversal of 138481550 is 55184831.

It is a self number, because there is not a number n which added to its sum of digits gives 138481550.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1384766 + ... + 1384865.

It is an arithmetic number, because the mean of its divisors is an integer number (21464648).

Almost surely, 2^138481550 is an apocalyptic number.

138481550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138481550 is a deficient number, since it is larger than the sum of its proper divisors (119094226).

138481550 is a wasteful number, since it uses less digits than its factorization.

138481550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2769643 (or 2769638 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 138481550 is about 11767.8184044452. The cubic root of 138481550 is about 517.3653099183.

The spelling of 138481550 in words is "one hundred thirty-eight million, four hundred eighty-one thousand, five hundred fifty".