12138772 has 6 divisors (see below), whose sum is σ = 21242858. Its totient is φ = 6069384.

The previous prime is 12138767. The next prime is 12138793. The reversal of 12138772 is 27783121.

12138772 is nontrivially palindromic in base 12.

It can be written as a sum of positive squares in only one way, i.e., 10732176 + 1406596 = 3276^2 + 1186^2 .

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 as a sum of consecutive naturals, namely, 1517343 + ... + 1517350.

Almost surely, 2^12138772 is an apocalyptic number.

It is an amenable number.

12138772 is a deficient number, since it is larger than the sum of its proper divisors (9104086).

12138772 is a wasteful number, since it uses less digits than its factorization.

12138772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3034697 (or 3034695 counting only the distinct ones).

The product of its digits is 4704, while the sum is 31.

The square root of 12138772 is about 3484.0740520259. The cubic root of 12138772 is about 229.8219920714.

The spelling of 12138772 in words is "twelve million, one hundred thirty-eight thousand, seven hundred seventy-two".