138028749 has 16 divisors (see below), whose sum is σ = 194611200. Its totient is φ = 86777136.

The previous prime is 138028747. The next prime is 138028783. The reversal of 138028749 is 947820831.

It is not a de Polignac number, because 138028749 - 2¹ = 138028747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138028749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138028741) 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 15 ways as a sum of consecutive naturals, for example, 7282 + ... + 18140.

It is an arithmetic number, because the mean of its divisors is an integer number (12163200).

Almost surely, 2^138028749 is an apocalyptic number.

138028749 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

138028749 is a deficient number, since it is larger than the sum of its proper divisors (56582451).

138028749 is a wasteful number, since it uses less digits than its factorization.

138028749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11104.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 138028749 is about 11748.5636994485. The cubic root of 138028749 is about 516.8008079496.

The spelling of 138028749 in words is "one hundred thirty-eight million, twenty-eight thousand, seven hundred forty-nine".