138020208 has 20 divisors (see below), whose sum is σ = 356552328. Its totient is φ = 46006720.

The previous prime is 138020203. The next prime is 138020243. The reversal of 138020208 is 802020831.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138020203) 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, 1437663 + ... + 1437758.

Almost surely, 2^138020208 is an apocalyptic number.

It is an amenable number.

138020208 is an abundant number, since it is smaller than the sum of its proper divisors (218532120).

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

138020208 is a wasteful number, since it uses less digits than its factorization.

138020208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2875432 (or 2875426 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 138020208 is about 11748.2002025842. The cubic root of 138020208 is about 516.7901481251.

The spelling of 138020208 in words is "one hundred thirty-eight million, twenty thousand, two hundred eight".