138632468 has 24 divisors (see below), whose sum is σ = 263592168. Its totient is φ = 63415296.

The previous prime is 138632449. The next prime is 138632503. The reversal of 138632468 is 864236831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18905104 + 119727364 = 4348^2 + 10942^2 .

It is a super-2 number, since 2×138632468² = 38437922367542048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5921 + ... + 17672.

It is an arithmetic number, because the mean of its divisors is an integer number (10983007).

Almost surely, 2^138632468 is an apocalyptic number.

It is an amenable number.

138632468 is a deficient number, since it is larger than the sum of its proper divisors (124959700).

138632468 is a wasteful number, since it uses less digits than its factorization.

138632468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23723 (or 23721 counting only the distinct ones).

The product of its digits is 165888, while the sum is 41.

The square root of 138632468 is about 11774.2289768800. The cubic root of 138632468 is about 517.5531842623.

The spelling of 138632468 in words is "one hundred thirty-eight million, six hundred thirty-two thousand, four hundred sixty-eight".