12139445 has 24 divisors (see below), whose sum is σ = 16032768. Its totient is φ = 8812800.

The previous prime is 12139417. The next prime is 12139447. The reversal of 12139445 is 54493121.

It is not a de Polignac number, because 12139445 - 2⁶ = 12139381 is a prime.

It is a super-2 number, since 2×12139445² = 294732249816050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12139447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44660 + ... + 44930.

It is an arithmetic number, because the mean of its divisors is an integer number (668032).

Almost surely, 2^12139445 is an apocalyptic number.

It is an amenable number.

12139445 is a deficient number, since it is larger than the sum of its proper divisors (3893323).

12139445 is a wasteful number, since it uses less digits than its factorization.

12139445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341 (or 324 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 12139445 is about 3484.1706330201. The cubic root of 12139445 is about 229.8262392705.

The spelling of 12139445 in words is "twelve million, one hundred thirty-nine thousand, four hundred forty-five".