11865428 has 24 divisors (see below), whose sum is σ = 21411432. Its totient is φ = 5750784.

The previous prime is 11865421. The next prime is 11865461. The reversal of 11865428 is 82456811.

It can be written as a sum of positive squares in 4 ways, for example, as 6492304 + 5373124 = 2548^2 + 2318^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11865421) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 20276 + ... + 20852.

It is an arithmetic number, because the mean of its divisors is an integer number (892143).

Almost surely, 2^11865428 is an apocalyptic number.

It is an amenable number.

11865428 is a deficient number, since it is larger than the sum of its proper divisors (9546004).

11865428 is a wasteful number, since it uses less digits than its factorization.

11865428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731 (or 729 counting only the distinct ones).

The product of its digits is 15360, while the sum is 35.

The square root of 11865428 is about 3444.6230563009. The cubic root of 11865428 is about 228.0838154963.

The spelling of 11865428 in words is "eleven million, eight hundred sixty-five thousand, four hundred twenty-eight".