138691395 has 12 divisors (see below), whose sum is σ = 240398496. Its totient is φ = 73968720.

The previous prime is 138691387. The next prime is 138691409. The reversal of 138691395 is 593196831.

It is not a de Polignac number, because 138691395 - 2³ = 138691387 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 3082031 = 138691395 / (1 + 3 + 8 + 6 + 9 + 1 + 3 + 9 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 138691395.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1540971 + ... + 1541060.

It is an arithmetic number, because the mean of its divisors is an integer number (20033208).

Almost surely, 2^138691395 is an apocalyptic number.

138691395 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138691395 is a deficient number, since it is larger than the sum of its proper divisors (101707101).

138691395 is a wasteful number, since it uses less digits than its factorization.

138691395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3082042 (or 3082039 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 138691395 is about 11776.7310829449. The cubic root of 138691395 is about 517.6265041149.

The spelling of 138691395 in words is "one hundred thirty-eight million, six hundred ninety-one thousand, three hundred ninety-five".