1408238728 has 16 divisors (see below), whose sum is σ = 2843559180. Its totient is φ = 649956288.

The previous prime is 1408238717. The next prime is 1408238731. The reversal of 1408238728 is 8278328041.

It can be written as a sum of positive squares in 2 ways, for example, as 1385179524 + 23059204 = 37218^2 + 4802^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6770275 + ... + 6770482.

Almost surely, 2^1408238728 is an apocalyptic number.

It is an amenable number.

1408238728 is an abundant number, since it is smaller than the sum of its proper divisors (1435320452).

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

1408238728 is a wasteful number, since it uses less digits than its factorization.

1408238728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13540776 (or 13540772 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 1408238728 is about 37526.5070050491. The cubic root of 1408238728 is about 1120.8790738761.

The spelling of 1408238728 in words is "one billion, four hundred eight million, two hundred thirty-eight thousand, seven hundred twenty-eight".