138255893 has 4 divisors (see below), whose sum is σ = 139809420. Its totient is φ = 136702368.

The previous prime is 138255881. The next prime is 138255919. The reversal of 138255893 is 398552831.

138255893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27227524 + 111028369 = 5218^2 + 10537^2 .

It is a cyclic number.

It is not a de Polignac number, because 138255893 - 2¹⁰ = 138254869 is a prime.

It is a super-2 number, since 2×138255893² = 38229383898454898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138255823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776630 + ... + 776807.

It is an arithmetic number, because the mean of its divisors is an integer number (34952355).

Almost surely, 2^138255893 is an apocalyptic number.

It is an amenable number.

138255893 is a deficient number, since it is larger than the sum of its proper divisors (1553527).

138255893 is an equidigital number, since it uses as much as digits as its factorization.

138255893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553526.

The product of its digits is 259200, while the sum is 44.

The square root of 138255893 is about 11758.2266094850. The cubic root of 138255893 is about 517.0841399123.

It can be divided in two parts, 1382 and 55893, that added together give a palindrome (57275).

The spelling of 138255893 in words is "one hundred thirty-eight million, two hundred fifty-five thousand, eight hundred ninety-three".