138021499 has 16 divisors (see below), whose sum is σ = 172592640. Its totient is φ = 107228160.

The previous prime is 138021497. The next prime is 138021503. The reversal of 138021499 is 994120831.

It is a cyclic number.

It is not a de Polignac number, because 138021499 - 2¹ = 138021497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138021493) 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, 25147 + ... + 30139.

It is an arithmetic number, because the mean of its divisors is an integer number (10787040).

Almost surely, 2^138021499 is an apocalyptic number.

138021499 is a deficient number, since it is larger than the sum of its proper divisors (34571141).

138021499 is a wasteful number, since it uses less digits than its factorization.

138021499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5370.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 138021499 is about 11748.2551470420. The cubic root of 138021499 is about 516.7917594205.

The spelling of 138021499 in words is "one hundred thirty-eight million, twenty-one thousand, four hundred ninety-nine".