138668074 has 4 divisors (see below), whose sum is σ = 208002114. Its totient is φ = 69334036.

The previous prime is 138668071. The next prime is 138668107. The reversal of 138668074 is 470866831.

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

It can be written as a sum of positive squares in only one way, i.e., 108889225 + 29778849 = 10435^2 + 5457^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138668074.

It is not an unprimeable number, because it can be changed into a prime (138668071) 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, 34667017 + ... + 34667020.

Almost surely, 2^138668074 is an apocalyptic number.

138668074 is a deficient number, since it is larger than the sum of its proper divisors (69334040).

138668074 is an equidigital number, since it uses as much as digits as its factorization.

138668074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69334039.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 138668074 is about 11775.7409108727. The cubic root of 138668074 is about 517.5974894708.

The spelling of 138668074 in words is "one hundred thirty-eight million, six hundred sixty-eight thousand, seventy-four".