1388904265 has 12 divisors (see below), whose sum is σ = 1938797316. Its totient is φ = 952391328.

The previous prime is 1388904259. The next prime is 1388904281. The reversal of 1388904265 is 5624098831.

1388904265 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 499254336 + 889649929 = 22344^2 + 29827^2 .

It is not a de Polignac number, because 1388904265 - 2¹⁹ = 1388379977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2834254 + ... + 2834743.

It is an arithmetic number, because the mean of its divisors is an integer number (161566443).

Almost surely, 2^1388904265 is an apocalyptic number.

It is an amenable number.

1388904265 is a deficient number, since it is larger than the sum of its proper divisors (549893051).

1388904265 is an equidigital number, since it uses as much as digits as its factorization.

1388904265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5669016 (or 5669009 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 46.

The square root of 1388904265 is about 37268.0059166036. The cubic root of 1388904265 is about 1115.7257007653.

The spelling of 1388904265 in words is "one billion, three hundred eighty-eight million, nine hundred four thousand, two hundred sixty-five".