1388225328 has 40 divisors (see below), whose sum is σ = 4098571008. Its totient is φ = 396635712.

The previous prime is 1388225303. The next prime is 1388225347. The reversal of 1388225328 is 8235228831.

It is a super-2 number, since 2×1388225328² = 3854339122601415168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 1388225328.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2065476 + ... + 2066147.

Almost surely, 2^1388225328 is an apocalyptic number.

It is an amenable number.

1388225328 is an abundant number, since it is smaller than the sum of its proper divisors (2710345680).

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

1388225328 is a wasteful number, since it uses less digits than its factorization.

1388225328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4131641 (or 4131635 counting only the distinct ones).

The product of its digits is 184320, while the sum is 42.

The square root of 1388225328 is about 37258.8959578783. The cubic root of 1388225328 is about 1115.5438713564.

The spelling of 1388225328 in words is "one billion, three hundred eighty-eight million, two hundred twenty-five thousand, three hundred twenty-eight".