138335955 has 16 divisors (see below), whose sum is σ = 221495040. Its totient is φ = 73726688.

The previous prime is 138335929. The next prime is 138335957. The reversal of 138335955 is 559533831.

It is a cyclic number.

It is not a de Polignac number, because 138335955 - 2¹¹ = 138333907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138335957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28324 + ... + 32846.

It is an arithmetic number, because the mean of its divisors is an integer number (13843440).

Almost surely, 2^138335955 is an apocalyptic number.

138335955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138335955 is a deficient number, since it is larger than the sum of its proper divisors (83159085).

138335955 is a wasteful number, since it uses less digits than its factorization.

138335955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6570.

The product of its digits is 243000, while the sum is 42.

The square root of 138335955 is about 11761.6306267456. The cubic root of 138335955 is about 517.1839326491.

The spelling of 138335955 in words is "one hundred thirty-eight million, three hundred thirty-five thousand, nine hundred fifty-five".