138768737 has 4 divisors (see below), whose sum is σ = 139487940. Its totient is φ = 138049536.

The previous prime is 138768727. The next prime is 138768743. The reversal of 138768737 is 737867831.

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

It can be written as a sum of positive squares in 2 ways, for example, as 97693456 + 41075281 = 9884^2 + 6409^2 .

It is a cyclic number.

It is not a de Polignac number, because 138768737 - 2⁶ = 138768673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138768727) 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, 359312 + ... + 359697.

It is an arithmetic number, because the mean of its divisors is an integer number (34871985).

Almost surely, 2^138768737 is an apocalyptic number.

It is an amenable number.

138768737 is a deficient number, since it is larger than the sum of its proper divisors (719203).

138768737 is an equidigital number, since it uses as much as digits as its factorization.

138768737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719202.

The product of its digits is 1185408, while the sum is 50.

The square root of 138768737 is about 11780.0143038962. The cubic root of 138768737 is about 517.7227052998.

The spelling of 138768737 in words is "one hundred thirty-eight million, seven hundred sixty-eight thousand, seven hundred thirty-seven".