138744863 has 4 divisors (see below), whose sum is σ = 140699088. Its totient is φ = 136790640.

The previous prime is 138744847. The next prime is 138744889. The reversal of 138744863 is 368447831.

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

It is a cyclic number.

It is not a de Polignac number, because 138744863 - 2⁴ = 138744847 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 (138744163) 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 3 ways as a sum of consecutive naturals, for example, 977006 + ... + 977147.

It is an arithmetic number, because the mean of its divisors is an integer number (35174772).

Almost surely, 2^138744863 is an apocalyptic number.

138744863 is a deficient number, since it is larger than the sum of its proper divisors (1954225).

138744863 is an equidigital number, since it uses as much as digits as its factorization.

138744863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954224.

The product of its digits is 387072, while the sum is 44.

The square root of 138744863 is about 11779.0009338653. Note that the first 3 decimals coincide. The cubic root of 138744863 is about 517.6930136440.

The spelling of 138744863 in words is "one hundred thirty-eight million, seven hundred forty-four thousand, eight hundred sixty-three".