138531395 has 8 divisors (see below), whose sum is σ = 167852256. Its totient is φ = 109748736.

The previous prime is 138531389. The next prime is 138531401. The reversal of 138531395 is 593135831.

It is an interprime number because it is at equal distance from previous prime (138531389) and next prime (138531401).

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

It is a cyclic number.

It is not a de Polignac number, because 138531395 - 2¹² = 138527299 is a prime.

It is a super-3 number, since 3×138531395³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133982 + ... + 135011.

It is an arithmetic number, because the mean of its divisors is an integer number (20981532).

Almost surely, 2^138531395 is an apocalyptic number.

138531395 is a deficient number, since it is larger than the sum of its proper divisors (29320861).

138531395 is a wasteful number, since it uses less digits than its factorization.

138531395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269101.

The product of its digits is 48600, while the sum is 38.

The square root of 138531395 is about 11769.9360660965. The cubic root of 138531395 is about 517.4273759009.

The spelling of 138531395 in words is "one hundred thirty-eight million, five hundred thirty-one thousand, three hundred ninety-five".