138443759 has 4 divisors (see below), whose sum is σ = 138596640. Its totient is φ = 138290880.

The previous prime is 138443749. The next prime is 138443771. The reversal of 138443759 is 957344831.

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 138443759 - 2¹⁶ = 138378223 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 (138443719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75074 + ... + 76895.

It is an arithmetic number, because the mean of its divisors is an integer number (34649160).

Almost surely, 2^138443759 is an apocalyptic number.

138443759 is a deficient number, since it is larger than the sum of its proper divisors (152881).

138443759 is an equidigital number, since it uses as much as digits as its factorization.

138443759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152880.

The product of its digits is 362880, while the sum is 44.

The square root of 138443759 is about 11766.2126021928. The cubic root of 138443759 is about 517.3182434048.

The spelling of 138443759 in words is "one hundred thirty-eight million, four hundred forty-three thousand, seven hundred fifty-nine".