138194715 has 32 divisors (see below), whose sum is σ = 229780800. Its totient is φ = 70837760.

The previous prime is 138194713. The next prime is 138194753. The reversal of 138194715 is 517491831.

It is not a de Polignac number, because 138194715 - 2¹ = 138194713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138194713) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116425 + ... + 117605.

It is an arithmetic number, because the mean of its divisors is an integer number (7180650).

Almost surely, 2^138194715 is an apocalyptic number.

138194715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138194715 is a deficient number, since it is larger than the sum of its proper divisors (91586085).

138194715 is a wasteful number, since it uses less digits than its factorization.

138194715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487.

The product of its digits is 30240, while the sum is 39.

The square root of 138194715 is about 11755.6248238875. The cubic root of 138194715 is about 517.0078590392.

The spelling of 138194715 in words is "one hundred thirty-eight million, one hundred ninety-four thousand, seven hundred fifteen".