138703787 has 4 divisors (see below), whose sum is σ = 142452576. Its totient is φ = 134955000.

The previous prime is 138703783. The next prime is 138703793. The reversal of 138703787 is 787307831.

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 138703787 - 2² = 138703783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138703783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1874339 + ... + 1874412.

It is an arithmetic number, because the mean of its divisors is an integer number (35613144).

Almost surely, 2^138703787 is an apocalyptic number.

138703787 is a deficient number, since it is larger than the sum of its proper divisors (3748789).

138703787 is an equidigital number, since it uses as much as digits as its factorization.

138703787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3748788.

The product of its (nonzero) digits is 197568, while the sum is 44.

The square root of 138703787 is about 11777.2571934216. The cubic root of 138703787 is about 517.6419202038.

The spelling of 138703787 in words is "one hundred thirty-eight million, seven hundred three thousand, seven hundred eighty-seven".