138400903 has 2 divisors, whose sum is σ = 138400904. Its totient is φ = 138400902.

The previous prime is 138400901. The next prime is 138400907. The reversal of 138400903 is 309004831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138400903 - 2¹ = 138400901 is a prime.

Together with 138400901, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138400901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69200451 + 69200452.

It is an arithmetic number, because the mean of its divisors is an integer number (69200452).

Almost surely, 2^138400903 is an apocalyptic number.

138400903 is a deficient number, since it is larger than the sum of its proper divisors (1).

138400903 is an equidigital number, since it uses as much as digits as its factorization.

138400903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 138400903 is about 11764.3913144710. The cubic root of 138400903 is about 517.2648583604.

The spelling of 138400903 in words is "one hundred thirty-eight million, four hundred thousand, nine hundred three".