138826720 has 48 divisors (see below), whose sum is σ = 334974528. Its totient is φ = 54346240.

The previous prime is 138826703. The next prime is 138826729. The reversal of 138826720 is 27628831.

It is a self number, because there is not a number n which added to its sum of digits gives 138826720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138826729) 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, 1711 + ... + 16750.

It is an arithmetic number, because the mean of its divisors is an integer number (6978636).

Almost surely, 2^138826720 is an apocalyptic number.

138826720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138826720 is an abundant number, since it is smaller than the sum of its proper divisors (196147808).

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

138826720 is a wasteful number, since it uses less digits than its factorization.

138826720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18523 (or 18515 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 138826720 is about 11782.4751219767. The cubic root of 138826720 is about 517.7948035168.

It can be divided in two parts, 13882 and 6720, that added together give a palindrome (20602).

The spelling of 138826720 in words is "one hundred thirty-eight million, eight hundred twenty-six thousand, seven hundred twenty".