138243037 has 4 divisors (see below), whose sum is σ = 139535136. Its totient is φ = 136950940.

The previous prime is 138242999. The next prime is 138243113. The reversal of 138243037 is 730342831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138243037 - 2¹¹ = 138240989 is a prime.

It is a super-2 number, since 2×138243037² = 38222274557966738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138246037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645889 + ... + 646102.

It is an arithmetic number, because the mean of its divisors is an integer number (34883784).

Almost surely, 2^138243037 is an apocalyptic number.

It is an amenable number.

138243037 is a deficient number, since it is larger than the sum of its proper divisors (1292099).

138243037 is a wasteful number, since it uses less digits than its factorization.

138243037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292098.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 138243037 is about 11757.6799156977. The cubic root of 138243037 is about 517.0681120488.

Adding to 138243037 its reverse (730342831), we get a palindrome (868585868).

It can be divided in two parts, 13824 and 3037, that added together give a palindrome (16861).

The spelling of 138243037 in words is "one hundred thirty-eight million, two hundred forty-three thousand, thirty-seven".