138484427 has 4 divisors (see below), whose sum is σ = 139829040. Its totient is φ = 137139816.

The previous prime is 138484417. The next prime is 138484447. The reversal of 138484427 is 724484831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138484427 - 2¹⁰ = 138483403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138484417) 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 3 ways as a sum of consecutive naturals, for example, 672152 + ... + 672357.

It is an arithmetic number, because the mean of its divisors is an integer number (34957260).

Almost surely, 2^138484427 is an apocalyptic number.

138484427 is a deficient number, since it is larger than the sum of its proper divisors (1344613).

138484427 is a wasteful number, since it uses less digits than its factorization.

138484427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344612.

The product of its digits is 172032, while the sum is 41.

The square root of 138484427 is about 11767.9406439700. The cubic root of 138484427 is about 517.3688927053.

The spelling of 138484427 in words is "one hundred thirty-eight million, four hundred eighty-four thousand, four hundred twenty-seven".