138620844 has 36 divisors (see below), whose sum is σ = 350961520. Its totient is φ = 46133280.

The previous prime is 138620843. The next prime is 138620849. The reversal of 138620844 is 448026831.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 138620799 and 138620808.

It is not an unprimeable number, because it can be changed into a prime (138620843) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 22809 + ... + 28239.

Almost surely, 2^138620844 is an apocalyptic number.

It is an amenable number.

138620844 is an abundant number, since it is smaller than the sum of its proper divisors (212340676).

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

138620844 is a wasteful number, since it uses less digits than its factorization.

138620844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6150 (or 6145 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 138620844 is about 11773.7353460998. The cubic root of 138620844 is about 517.5387186601.

The spelling of 138620844 in words is "one hundred thirty-eight million, six hundred twenty thousand, eight hundred forty-four".