1388628563 has 4 divisors (see below), whose sum is σ = 1587004080. Its totient is φ = 1190253048.

The previous prime is 1388628529. The next prime is 1388628607. The reversal of 1388628563 is 3658268831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3658268831 = 7 ⋅522609833.

It is a cyclic number.

It is not a de Polignac number, because 1388628563 - 2²⁰ = 1387579987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388628503) 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, 99187748 + ... + 99187761.

It is an arithmetic number, because the mean of its divisors is an integer number (396751020).

Almost surely, 2^1388628563 is an apocalyptic number.

1388628563 is a deficient number, since it is larger than the sum of its proper divisors (198375517).

1388628563 is an equidigital number, since it uses as much as digits as its factorization.

1388628563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198375516.

The product of its digits is 1658880, while the sum is 50.

The square root of 1388628563 is about 37264.3068230177. The cubic root of 1388628563 is about 1115.6518708235.

The spelling of 1388628563 in words is "one billion, three hundred eighty-eight million, six hundred twenty-eight thousand, five hundred sixty-three".