138378285 has 48 divisors (see below), whose sum is σ = 250698240. Its totient is φ = 70519680.

The previous prime is 138378271. The next prime is 138378287. The reversal of 138378285 is 582873831.

It is not a de Polignac number, because 138378285 - 2¹⁶ = 138312749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 138378285.

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 47 ways as a sum of consecutive naturals, for example, 139140 + ... + 140130.

It is an arithmetic number, because the mean of its divisors is an integer number (5222880).

Almost surely, 2^138378285 is an apocalyptic number.

138378285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138378285 is a deficient number, since it is larger than the sum of its proper divisors (112319955).

138378285 is a wasteful number, since it uses less digits than its factorization.

138378285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138 (or 1135 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 138378285 is about 11763.4299844901. The cubic root of 138378285 is about 517.2366790309.

It can be divided in two parts, 13837 and 8285, that added together give a palindrome (22122).

The spelling of 138378285 in words is "one hundred thirty-eight million, three hundred seventy-eight thousand, two hundred eighty-five".