138503264 has 12 divisors (see below), whose sum is σ = 272678364. Its totient is φ = 69251616.

The previous prime is 138503251. The next prime is 138503273. The reversal of 138503264 is 462305831.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 4328227 = 138503264 / (1 + 3 + 8 + 5 + 0 + 3 + 2 + 6 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 138503264.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2164082 + ... + 2164145.

It is an arithmetic number, because the mean of its divisors is an integer number (22723197).

Almost surely, 2^138503264 is an apocalyptic number.

It is an amenable number.

138503264 is a deficient number, since it is larger than the sum of its proper divisors (134175100).

138503264 is an equidigital number, since it uses as much as digits as its factorization.

138503264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4328237 (or 4328229 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 138503264 is about 11768.7409691946. The cubic root of 138503264 is about 517.3923495810.

The spelling of 138503264 in words is "one hundred thirty-eight million, five hundred three thousand, two hundred sixty-four".