138378276 has 18 divisors (see below), whose sum is σ = 349789622. Its totient is φ = 46126080.

The previous prime is 138378271. The next prime is 138378287. The reversal of 138378276 is 672873831.

138378276 is a `hidden beast` number, since 1 + 3 + 8 + 378 + 276 = 666.

138378276 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 119246400 + 19131876 = 10920^2 + 4374^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (138378271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1921885 + ... + 1921956.

Almost surely, 2^138378276 is an apocalyptic number.

It is an amenable number.

138378276 is an abundant number, since it is smaller than the sum of its proper divisors (211411346).

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

138378276 is a wasteful number, since it uses less digits than its factorization.

138378276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3843851 (or 3843846 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 138378276 is about 11763.4296019486. The cubic root of 138378276 is about 517.2366678173.

The spelling of 138378276 in words is "one hundred thirty-eight million, three hundred seventy-eight thousand, two hundred seventy-six".