138568620 has 24 divisors (see below), whose sum is σ = 387992304. Its totient is φ = 36951616.

The previous prime is 138568609. The next prime is 138568621. The reversal of 138568620 is 26865831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (138568621) 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 7 ways as a sum of consecutive naturals, for example, 1154679 + ... + 1154798.

It is an arithmetic number, because the mean of its divisors is an integer number (16166346).

Almost surely, 2^138568620 is an apocalyptic number.

138568620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138568620 is an abundant number, since it is smaller than the sum of its proper divisors (249423684).

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

138568620 is a wasteful number, since it uses less digits than its factorization.

138568620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309489 (or 2309487 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 138568620 is about 11771.5173193603. The cubic root of 138568620 is about 517.4737180053.

The spelling of 138568620 in words is "one hundred thirty-eight million, five hundred sixty-eight thousand, six hundred twenty".