138091395 has 16 divisors (see below), whose sum is σ = 237942432. Its totient is φ = 67983360.

The previous prime is 138091381. The next prime is 138091397. The reversal of 138091395 is 593190831.

It is not a de Polignac number, because 138091395 - 2²³ = 129702787 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (138091397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353886 + ... + 354275.

It is an arithmetic number, because the mean of its divisors is an integer number (14871402).

Almost surely, 2^138091395 is an apocalyptic number.

138091395 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138091395 is a deficient number, since it is larger than the sum of its proper divisors (99851037).

138091395 is a wasteful number, since it uses less digits than its factorization.

138091395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708182.

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 138091395 is about 11751.2295101406. The cubic root of 138091395 is about 516.8789815352.

The spelling of 138091395 in words is "one hundred thirty-eight million, ninety-one thousand, three hundred ninety-five".