138288855 has 16 divisors (see below), whose sum is σ = 221800320. Its totient is φ = 73574688.

The previous prime is 138288853. The next prime is 138288883. The reversal of 138288855 is 558882831.

It is a happy number.

It is not a de Polignac number, because 138288855 - 2¹ = 138288853 is a prime.

It is a super-2 number, since 2×138288855² = 38247614834422050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138288853) 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, 4717 + ... + 17286.

It is an arithmetic number, because the mean of its divisors is an integer number (13862520).

Almost surely, 2^138288855 is an apocalyptic number.

138288855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138288855 is a deficient number, since it is larger than the sum of its proper divisors (83511465).

138288855 is a wasteful number, since it uses less digits than its factorization.

138288855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22430.

The product of its digits is 614400, while the sum is 48.

The square root of 138288855 is about 11759.6281828976. The cubic root of 138288855 is about 517.1252298379.

The spelling of 138288855 in words is "one hundred thirty-eight million, two hundred eighty-eight thousand, eight hundred fifty-five".