12091388 has 6 divisors (see below), whose sum is σ = 21159936. Its totient is φ = 6045692.

The previous prime is 12091381. The next prime is 12091411. The reversal of 12091388 is 88319021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12091381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1511420 + ... + 1511427.

It is an arithmetic number, because the mean of its divisors is an integer number (3526656).

Almost surely, 2^12091388 is an apocalyptic number.

It is an amenable number.

12091388 is a deficient number, since it is larger than the sum of its proper divisors (9068548).

12091388 is a wasteful number, since it uses less digits than its factorization.

12091388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3022851 (or 3022849 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 12091388 is about 3477.2673178805. The cubic root of 12091388 is about 229.5225634931.

The spelling of 12091388 in words is "twelve million, ninety-one thousand, three hundred eighty-eight".