138503864 has 8 divisors (see below), whose sum is σ = 259694760. Its totient is φ = 69251928.

The previous prime is 138503819. The next prime is 138503873. The reversal of 138503864 is 468305831.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 8656484 + ... + 8656499.

It is an arithmetic number, because the mean of its divisors is an integer number (32461845).

Almost surely, 2^138503864 is an apocalyptic number.

It is an amenable number.

138503864 is a deficient number, since it is larger than the sum of its proper divisors (121190896).

138503864 is a wasteful number, since it uses less digits than its factorization.

138503864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17312989 (or 17312985 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 138503864 is about 11768.7664604240. The cubic root of 138503864 is about 517.3930966993.

The spelling of 138503864 in words is "one hundred thirty-eight million, five hundred three thousand, eight hundred sixty-four".