138378955 has 32 divisors (see below), whose sum is σ = 197084160. Its totient is φ = 91946880.

The previous prime is 138378949. The next prime is 138378959. The reversal of 138378955 is 559873831.

It is not a de Polignac number, because 138378955 - 2¹¹ = 138376907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138378899 and 138378908.

It is not an unprimeable number, because it can be changed into a prime (138378959) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72706 + ... + 74584.

It is an arithmetic number, because the mean of its divisors is an integer number (6158880).

Almost surely, 2^138378955 is an apocalyptic number.

138378955 is a deficient number, since it is larger than the sum of its proper divisors (58705205).

138378955 is a wasteful number, since it uses less digits than its factorization.

138378955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011.

The product of its digits is 907200, while the sum is 49.

The square root of 138378955 is about 11763.4584625441. The cubic root of 138378955 is about 517.2375138150.

The spelling of 138378955 in words is "one hundred thirty-eight million, three hundred seventy-eight thousand, nine hundred fifty-five".