138208650 has 48 divisors (see below), whose sum is σ = 343665504. Its totient is φ = 36758080.

The previous prime is 138208649. The next prime is 138208667. The reversal of 138208650 is 56802831.

It is a happy number.

138208650 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69064 + ... + 71036.

It is an arithmetic number, because the mean of its divisors is an integer number (7159698).

Almost surely, 2^138208650 is an apocalyptic number.

138208650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138208650 is an abundant number, since it is smaller than the sum of its proper divisors (205456854).

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

138208650 is a wasteful number, since it uses less digits than its factorization.

138208650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2455 (or 2450 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 138208650 is about 11756.2175039423. The cubic root of 138208650 is about 517.0252361205.

The spelling of 138208650 in words is "one hundred thirty-eight million, two hundred eight thousand, six hundred fifty".