138143855 has 4 divisors (see below), whose sum is σ = 165772632. Its totient is φ = 110515080.

The previous prime is 138143827. The next prime is 138143879. The reversal of 138143855 is 558341831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 558341831 = 10271 ⋅54361.

It is not a de Polignac number, because 138143855 - 2¹⁰ = 138142831 is a prime.

It is a super-2 number, since 2×138143855² = 38167449348522050, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 13814381 + ... + 13814390.

It is an arithmetic number, because the mean of its divisors is an integer number (41443158).

Almost surely, 2^138143855 is an apocalyptic number.

138143855 is a deficient number, since it is larger than the sum of its proper divisors (27628777).

138143855 is an equidigital number, since it uses as much as digits as its factorization.

138143855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27628776.

The product of its digits is 57600, while the sum is 38.

The square root of 138143855 is about 11753.4614050500. The cubic root of 138143855 is about 516.9444262078.

The spelling of 138143855 in words is "one hundred thirty-eight million, one hundred forty-three thousand, eight hundred fifty-five".