12155444 has 24 divisors (see below), whose sum is σ = 24772608. Its totient is φ = 5110560.

The previous prime is 12155419. The next prime is 12155447. The reversal of 12155444 is 44455121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2612 + ... + 5579.

It is an arithmetic number, because the mean of its divisors is an integer number (1032192).

Almost surely, 2^12155444 is an apocalyptic number.

12155444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

12155444 is an abundant number, since it is smaller than the sum of its proper divisors (12617164).

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

12155444 is a wasteful number, since it uses less digits than its factorization.

12155444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8255 (or 8253 counting only the distinct ones).

The product of its digits is 3200, while the sum is 26.

The square root of 12155444 is about 3486.4658323294. The cubic root of 12155444 is about 229.9271602994.

The spelling of 12155444 in words is "twelve million, one hundred fifty-five thousand, four hundred forty-four".