1440399228 has 12 divisors (see below), whose sum is σ = 3360931560. Its totient is φ = 480133072.

The previous prime is 1440399227. The next prime is 1440399263. The reversal of 1440399228 is 8229930441.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1440399228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440399227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60016623 + ... + 60016646.

It is an arithmetic number, because the mean of its divisors is an integer number (280077630).

Almost surely, 2^1440399228 is an apocalyptic number.

It is an amenable number.

1440399228 is an abundant number, since it is smaller than the sum of its proper divisors (1920532332).

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

1440399228 is a wasteful number, since it uses less digits than its factorization.

1440399228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120033276 (or 120033274 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 1440399228 is about 37952.5918482519. The cubic root of 1440399228 is about 1129.3475827734.

The spelling of 1440399228 in words is "one billion, four hundred forty million, three hundred ninety-nine thousand, two hundred twenty-eight".