138366393 has 16 divisors (see below), whose sum is σ = 201510912. Its totient is φ = 83754000.

The previous prime is 138366391. The next prime is 138366401. The reversal of 138366393 is 393663831.

It is not a de Polignac number, because 138366393 - 2¹ = 138366391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138366391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30588 + ... + 34818.

It is an arithmetic number, because the mean of its divisors is an integer number (12594432).

Almost surely, 2^138366393 is an apocalyptic number.

It is an amenable number.

138366393 is a deficient number, since it is larger than the sum of its proper divisors (63144519).

138366393 is a wasteful number, since it uses less digits than its factorization.

138366393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5236.

The product of its digits is 209952, while the sum is 42.

The square root of 138366393 is about 11762.9245088116. The cubic root of 138366393 is about 517.2218617860.

It can be divided in two parts, 1383 and 66393, that added together give a palindrome (67776).

The spelling of 138366393 in words is "one hundred thirty-eight million, three hundred sixty-six thousand, three hundred ninety-three".