138535555 has 48 divisors (see below), whose sum is σ = 189609984. Its totient is φ = 96909120.

The previous prime is 138535543. The next prime is 138535577. The reversal of 138535555 is 555535831.

It is a happy number.

It is not a de Polignac number, because 138535555 - 2²¹ = 136438403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1951170 + ... + 1951240.

It is an arithmetic number, because the mean of its divisors is an integer number (3950208).

Almost surely, 2^138535555 is an apocalyptic number.

138535555 is a deficient number, since it is larger than the sum of its proper divisors (51074429).

138535555 is a wasteful number, since it uses less digits than its factorization.

138535555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 165 counting only the distinct ones).

The product of its digits is 225000, while the sum is 40.

The square root of 138535555 is about 11770.1127862056. The cubic root of 138535555 is about 517.4325551754.

The spelling of 138535555 in words is "one hundred thirty-eight million, five hundred thirty-five thousand, five hundred fifty-five".