138378286 has 8 divisors (see below), whose sum is σ = 207700344. Its totient is φ = 69144840.

The previous prime is 138378271. The next prime is 138378287. The reversal of 138378286 is 682873831.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138378287) 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, 18100 + ... + 24583.

It is an arithmetic number, because the mean of its divisors is an integer number (25962543).

Almost surely, 2^138378286 is an apocalyptic number.

138378286 is a deficient number, since it is larger than the sum of its proper divisors (69322058).

138378286 is a wasteful number, since it uses less digits than its factorization.

138378286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44306.

The product of its digits is 387072, while the sum is 46.

The square root of 138378286 is about 11763.4300269947. The cubic root of 138378286 is about 517.2366802768.

The spelling of 138378286 in words is "one hundred thirty-eight million, three hundred seventy-eight thousand, two hundred eighty-six".