138535786 has 8 divisors (see below), whose sum is σ = 208880964. Its totient is φ = 68908800.

The previous prime is 138535781. The next prime is 138535801. The reversal of 138535786 is 687535831.

It can be written as a sum of positive squares in 2 ways, for example, as 130667761 + 7868025 = 11431^2 + 2805^2 .

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

It is not an unprimeable number, because it can be changed into a prime (138535781) 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, 179065 + ... + 179836.

Almost surely, 2^138535786 is an apocalyptic number.

138535786 is a deficient number, since it is larger than the sum of its proper divisors (70345178).

138535786 is a wasteful number, since it uses less digits than its factorization.

138535786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359096.

The product of its digits is 604800, while the sum is 46.

The square root of 138535786 is about 11770.1225991916. The cubic root of 138535786 is about 517.4328427714.

The spelling of 138535786 in words is "one hundred thirty-eight million, five hundred thirty-five thousand, seven hundred eighty-six".