138255078 has 16 divisors (see below), whose sum is σ = 297780336. Its totient is φ = 42540000.

The previous prime is 138255049. The next prime is 138255079. The reversal of 138255078 is 870552831.

It is a super-2 number, since 2×138255078² = 38228933185572168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138255079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 886173 + ... + 886328.

It is an arithmetic number, because the mean of its divisors is an integer number (18611271).

Almost surely, 2^138255078 is an apocalyptic number.

138255078 is an abundant number, since it is smaller than the sum of its proper divisors (159525258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138255078 is a wasteful number, since it uses less digits than its factorization.

138255078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772519.

The product of its (nonzero) digits is 67200, while the sum is 39.

The square root of 138255078 is about 11758.1919528472. The cubic root of 138255078 is about 517.0831238630.

The spelling of 138255078 in words is "one hundred thirty-eight million, two hundred fifty-five thousand, seventy-eight".