138508737 has 16 divisors (see below), whose sum is σ = 192985728. Its totient is φ = 88197120.

The previous prime is 138508729. The next prime is 138508739. The reversal of 138508737 is 737805831.

It is not a de Polignac number, because 138508737 - 2³ = 138508729 is a prime.

It is a super-3 number, since 3×138508737³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (138508739) 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 15 ways as a sum of consecutive naturals, for example, 78687 + ... + 80427.

It is an arithmetic number, because the mean of its divisors is an integer number (12061608).

Almost surely, 2^138508737 is an apocalyptic number.

It is an amenable number.

138508737 is a deficient number, since it is larger than the sum of its proper divisors (54476991).

138508737 is a wasteful number, since it uses less digits than its factorization.

138508737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 138508737 is about 11768.9734896464. The cubic root of 138508737 is about 517.3991644650.

The spelling of 138508737 in words is "one hundred thirty-eight million, five hundred eight thousand, seven hundred thirty-seven".