138378274 has 8 divisors (see below), whose sum is σ = 207733788. Its totient is φ = 69133680.

The previous prime is 138378271. The next prime is 138378287. The reversal of 138378274 is 472873831.

138378274 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 2 ways, for example, as 127848249 + 10530025 = 11307^2 + 3245^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 138378274.

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 3 ways as a sum of consecutive naturals, for example, 24537 + ... + 29644.

Almost surely, 2^138378274 is an apocalyptic number.

138378274 is a deficient number, since it is larger than the sum of its proper divisors (69355514).

138378274 is a wasteful number, since it uses less digits than its factorization.

138378274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55460.

The product of its digits is 225792, while the sum is 43.

The square root of 138378274 is about 11763.4295169394. The cubic root of 138378274 is about 517.2366653254.

The spelling of 138378274 in words is "one hundred thirty-eight million, three hundred seventy-eight thousand, two hundred seventy-four".