138008743 has 4 divisors (see below), whose sum is σ = 138546000. Its totient is φ = 137471488.

The previous prime is 138008719. The next prime is 138008749. The reversal of 138008743 is 347800831.

138008743 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 138008743 - 2¹⁷ = 137877671 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138008699 and 138008708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138008749) 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, 268243 + ... + 268756.

It is an arithmetic number, because the mean of its divisors is an integer number (34636500).

Almost surely, 2^138008743 is an apocalyptic number.

138008743 is a deficient number, since it is larger than the sum of its proper divisors (537257).

138008743 is an equidigital number, since it uses as much as digits as its factorization.

138008743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537256.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 138008743 is about 11747.7122453693. The cubic root of 138008743 is about 516.7758382323.

The spelling of 138008743 in words is "one hundred thirty-eight million, eight thousand, seven hundred forty-three".