138550507 has 4 divisors (see below), whose sum is σ = 138950136. Its totient is φ = 138150880.

The previous prime is 138550469. The next prime is 138550513. The reversal of 138550507 is 705055831.

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 138550507 - 2¹⁵ = 138517739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138550567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199294 + ... + 199987.

It is an arithmetic number, because the mean of its divisors is an integer number (34737534).

Almost surely, 2^138550507 is an apocalyptic number.

138550507 is a deficient number, since it is larger than the sum of its proper divisors (399629).

138550507 is an equidigital number, since it uses as much as digits as its factorization.

138550507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399628.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 138550507 is about 11770.7479371534. The cubic root of 138550507 is about 517.4511698269.

The spelling of 138550507 in words is "one hundred thirty-eight million, five hundred fifty thousand, five hundred seven".