138550305 has 32 divisors (see below), whose sum is σ = 227664000. Its totient is φ = 71926272.

The previous prime is 138550303. The next prime is 138550319. The reversal of 138550305 is 503055831.

It is not a de Polignac number, because 138550305 - 2¹ = 138550303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138550301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88671 + ... + 90219.

It is an arithmetic number, because the mean of its divisors is an integer number (7114500).

Almost surely, 2^138550305 is an apocalyptic number.

138550305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138550305 is a deficient number, since it is larger than the sum of its proper divisors (89113695).

138550305 is a wasteful number, since it uses less digits than its factorization.

138550305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 138550305 is about 11770.7393565570. The cubic root of 138550305 is about 517.4509183538.

The spelling of 138550305 in words is "one hundred thirty-eight million, five hundred fifty thousand, three hundred five".