138550830 has 64 divisors (see below), whose sum is σ = 370510848. Its totient is φ = 32869760.

The previous prime is 138550817. The next prime is 138550837. The reversal of 138550830 is 38055831.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138550791 and 138550800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138550837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11044 + ... + 19976.

It is an arithmetic number, because the mean of its divisors is an integer number (5789232).

Almost surely, 2^138550830 is an apocalyptic number.

138550830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138550830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185255424).

138550830 is an abundant number, since it is smaller than the sum of its proper divisors (231960018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138550830 is a wasteful number, since it uses less digits than its factorization.

138550830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9001.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 138550830 is about 11770.7616575989. The cubic root of 138550830 is about 517.4515719344.

The spelling of 138550830 in words is "one hundred thirty-eight million, five hundred fifty thousand, eight hundred thirty".