138263507 has 8 divisors (see below), whose sum is σ = 139579200. Its totient is φ = 136953280.

The previous prime is 138263473. The next prime is 138263537. The reversal of 138263507 is 705362831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138263507 - 2²⁴ = 121486291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138263537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63143 + ... + 65295.

It is an arithmetic number, because the mean of its divisors is an integer number (17447400).

Almost surely, 2^138263507 is an apocalyptic number.

138263507 is a deficient number, since it is larger than the sum of its proper divisors (1315693).

138263507 is a wasteful number, since it uses less digits than its factorization.

138263507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2733.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 138263507 is about 11758.5503783417. The cubic root of 138263507 is about 517.0936319884.

The spelling of 138263507 in words is "one hundred thirty-eight million, two hundred sixty-three thousand, five hundred seven".