138726663 has 8 divisors (see below), whose sum is σ = 185928048. Its totient is φ = 92004864.

The previous prime is 138726661. The next prime is 138726671. The reversal of 138726663 is 366627831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138726663 - 2¹ = 138726661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138726661) 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 in 7 ways as a sum of consecutive naturals, for example, 119220 + ... + 120377.

It is an arithmetic number, because the mean of its divisors is an integer number (23241006).

Almost surely, 2^138726663 is an apocalyptic number.

138726663 is a deficient number, since it is larger than the sum of its proper divisors (47201385).

138726663 is a wasteful number, since it uses less digits than its factorization.

138726663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239793.

The product of its digits is 217728, while the sum is 42.

The square root of 138726663 is about 11778.2283472516. The cubic root of 138726663 is about 517.6703763497.

The spelling of 138726663 in words is "one hundred thirty-eight million, seven hundred twenty-six thousand, six hundred sixty-three".