12291428 has 6 divisors (see below), whose sum is σ = 21510006. Its totient is φ = 6145712.

The previous prime is 12291427. The next prime is 12291443. The reversal of 12291428 is 82419221.

It can be written as a sum of positive squares in only one way, i.e., 11142244 + 1149184 = 3338^2 + 1072^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12291428.

It is not an unprimeable number, because it can be changed into a prime (12291427) 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 as a sum of consecutive naturals, namely, 1536425 + ... + 1536432.

It is an arithmetic number, because the mean of its divisors is an integer number (3585001).

Almost surely, 2^12291428 is an apocalyptic number.

It is an amenable number.

12291428 is a deficient number, since it is larger than the sum of its proper divisors (9218578).

12291428 is a wasteful number, since it uses less digits than its factorization.

12291428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3072861 (or 3072859 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 12291428 is about 3505.9132904280. The cubic root of 12291428 is about 230.7813877242.

The spelling of 12291428 in words is "twelve million, two hundred ninety-one thousand, four hundred twenty-eight".