138641774 has 4 divisors (see below), whose sum is σ = 207962664. Its totient is φ = 69320886.

The previous prime is 138641773. The next prime is 138641843. The reversal of 138641774 is 477146831.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138641773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34660442 + ... + 34660445.

It is an arithmetic number, because the mean of its divisors is an integer number (51990666).

Almost surely, 2^138641774 is an apocalyptic number.

138641774 is a deficient number, since it is larger than the sum of its proper divisors (69320890).

138641774 is an equidigital number, since it uses as much as digits as its factorization.

138641774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69320889.

The product of its digits is 112896, while the sum is 41.

The square root of 138641774 is about 11774.6241553605. The cubic root of 138641774 is about 517.5647646235.

The spelling of 138641774 in words is "one hundred thirty-eight million, six hundred forty-one thousand, seven hundred seventy-four".