138177378 has 36 divisors (see below), whose sum is σ = 302322930. Its totient is φ = 45611136.

The previous prime is 138177341. The next prime is 138177379. The reversal of 138177378 is 873771831.

It can be written as a sum of positive squares in 3 ways, for example, as 137663289 + 514089 = 11733^2 + 717^2 .

It is not an unprimeable number, because it can be changed into a prime (138177379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 337638 + ... + 338046.

Almost surely, 2^138177378 is an apocalyptic number.

138177378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138177378 is an abundant number, since it is smaller than the sum of its proper divisors (164145552).

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

138177378 is a wasteful number, since it uses less digits than its factorization.

138177378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691 (or 551 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 138177378 is about 11754.8874090737. The cubic root of 138177378 is about 516.9862379999.

The spelling of 138177378 in words is "one hundred thirty-eight million, one hundred seventy-seven thousand, three hundred seventy-eight".