138539562 has 96 divisors (see below), whose sum is σ = 348380352. Its totient is φ = 36481536.

The previous prime is 138539561. The next prime is 138539563. The reversal of 138539562 is 265935831.

It is an interprime number because it is at equal distance from previous prime (138539561) and next prime (138539563).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (138539561) 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 47 ways as a sum of consecutive naturals, for example, 264633 + ... + 265155.

It is an arithmetic number, because the mean of its divisors is an integer number (3628962).

Almost surely, 2^138539562 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138539562, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174190176).

138539562 is an abundant number, since it is smaller than the sum of its proper divisors (209840790).

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

138539562 is a wasteful number, since it uses less digits than its factorization.

138539562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612 (or 605 counting only the distinct ones).

The product of its digits is 194400, while the sum is 42.

The square root of 138539562 is about 11770.2830042442. The cubic root of 138539562 is about 517.4375438640.

The spelling of 138539562 in words is "one hundred thirty-eight million, five hundred thirty-nine thousand, five hundred sixty-two".