1388897473 has 4 divisors (see below), whose sum is σ = 1461997360. Its totient is φ = 1315797588.

The previous prime is 1388897459. The next prime is 1388897479. The reversal of 1388897473 is 3747988831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1388897473 - 2⁹ = 1388896961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388897479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36549915 + ... + 36549952.

It is an arithmetic number, because the mean of its divisors is an integer number (365499340).

Almost surely, 2^1388897473 is an apocalyptic number.

It is an amenable number.

1388897473 is a deficient number, since it is larger than the sum of its proper divisors (73099887).

1388897473 is an equidigital number, since it uses as much as digits as its factorization.

1388897473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73099886.

The product of its digits is 8128512, while the sum is 58.

The square root of 1388897473 is about 37267.9147927544. The cubic root of 1388897473 is about 1115.7238820603.

The spelling of 1388897473 in words is "one billion, three hundred eighty-eight million, eight hundred ninety-seven thousand, four hundred seventy-three".