1388561004 has 18 divisors (see below), whose sum is σ = 3509973740. Its totient is φ = 462853656.

The previous prime is 1388560993. The next prime is 1388561011. The reversal of 1388561004 is 4001658831.

1388561004 is a `hidden beast` number, since 1 + 38 + 8 + 5 + 610 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 38571139 = 1388561004 / (1 + 3 + 8 + 8 + 5 + 6 + 1 + 0 + 0 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 1388561004.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19285534 + ... + 19285605.

Almost surely, 2^1388561004 is an apocalyptic number.

It is an amenable number.

1388561004 is an abundant number, since it is smaller than the sum of its proper divisors (2121412736).

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

1388561004 is a wasteful number, since it uses less digits than its factorization.

1388561004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38571149 (or 38571144 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1388561004 is about 37263.4003279357. The cubic root of 1388561004 is about 1115.6337777809.

The spelling of 1388561004 in words is "one billion, three hundred eighty-eight million, five hundred sixty-one thousand, four".