138239549 has 16 divisors (see below), whose sum is σ = 166924800. Its totient is φ = 111963264.

The previous prime is 138239533. The next prime is 138239551. The reversal of 138239549 is 945932831.

It is not a de Polignac number, because 138239549 - 2⁴ = 138239533 is a prime.

It is a super-2 number, since 2×138239549² = 38220345815446802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138239449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2297 + ... + 16785.

It is an arithmetic number, because the mean of its divisors is an integer number (10432800).

Almost surely, 2^138239549 is an apocalyptic number.

It is an amenable number.

138239549 is a deficient number, since it is larger than the sum of its proper divisors (28685251).

138239549 is a wasteful number, since it uses less digits than its factorization.

138239549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14572.

The product of its digits is 233280, while the sum is 44.

The square root of 138239549 is about 11757.5315861791. The cubic root of 138239549 is about 517.0637633096.

The spelling of 138239549 in words is "one hundred thirty-eight million, two hundred thirty-nine thousand, five hundred forty-nine".