138194791 has 8 divisors (see below), whose sum is σ = 159471104. Its totient is φ = 117302040.

The previous prime is 138194789. The next prime is 138194801. The reversal of 138194791 is 197491831.

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 138194791 - 2¹ = 138194789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138194761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95115 + ... + 96556.

It is an arithmetic number, because the mean of its divisors is an integer number (19933888).

Almost surely, 2^138194791 is an apocalyptic number.

138194791 is a deficient number, since it is larger than the sum of its proper divisors (21276313).

138194791 is a wasteful number, since it uses less digits than its factorization.

138194791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191781.

The product of its digits is 54432, while the sum is 43.

The square root of 138194791 is about 11755.6280563822. The cubic root of 138194791 is about 517.0079538151.

The spelling of 138194791 in words is "one hundred thirty-eight million, one hundred ninety-four thousand, seven hundred ninety-one".