138550819 has 4 divisors (see below), whose sum is σ = 151146360. Its totient is φ = 125955280.

The previous prime is 138550817. The next prime is 138550837. The reversal of 138550819 is 918055831.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 138550819 - 2¹ = 138550817 is a prime.

It is a super-2 number, since 2×138550819² = 38392658891141522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138550813) 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, 6297754 + ... + 6297775.

It is an arithmetic number, because the mean of its divisors is an integer number (37786590).

Almost surely, 2^138550819 is an apocalyptic number.

138550819 is a deficient number, since it is larger than the sum of its proper divisors (12595541).

138550819 is a wasteful number, since it uses less digits than its factorization.

138550819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12595540.

The product of its (nonzero) digits is 43200, while the sum is 40.

The square root of 138550819 is about 11770.7611903394. The cubic root of 138550819 is about 517.4515582403.

The spelling of 138550819 in words is "one hundred thirty-eight million, five hundred fifty thousand, eight hundred nineteen".