1388656623 has 8 divisors (see below), whose sum is σ = 1853940528. Its totient is φ = 924571904.

The previous prime is 1388656601. The next prime is 1388656639. The reversal of 1388656623 is 3266568831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1388656623 - 2²⁴ = 1371879407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388656693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297090 + ... + 301727.

It is an arithmetic number, because the mean of its divisors is an integer number (231742566).

Almost surely, 2^1388656623 is an apocalyptic number.

1388656623 is a deficient number, since it is larger than the sum of its proper divisors (465283905).

1388656623 is an equidigital number, since it uses as much as digits as its factorization.

1388656623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599593.

The product of its digits is 1244160, while the sum is 48.

The square root of 1388656623 is about 37264.6833208066. The cubic root of 1388656623 is about 1115.6593854273.

The spelling of 1388656623 in words is "one billion, three hundred eighty-eight million, six hundred fifty-six thousand, six hundred twenty-three".