1388832479 has 4 divisors (see below), whose sum is σ = 1389317760. Its totient is φ = 1388347200.

The previous prime is 1388832463. The next prime is 1388832509. The reversal of 1388832479 is 9742388831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9742388831 = 7 ⋅1391769833.

It is a cyclic number.

It is not a de Polignac number, because 1388832479 - 2⁴ = 1388832463 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1388832479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385832479) 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, 238322 + ... + 244079.

It is an arithmetic number, because the mean of its divisors is an integer number (347329440).

Almost surely, 2^1388832479 is an apocalyptic number.

1388832479 is a deficient number, since it is larger than the sum of its proper divisors (485281).

1388832479 is an equidigital number, since it uses as much as digits as its factorization.

1388832479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485280.

The product of its digits is 2322432, while the sum is 53.

The square root of 1388832479 is about 37267.0427992348. The cubic root of 1388832479 is about 1115.7064782104.

The spelling of 1388832479 in words is "one billion, three hundred eighty-eight million, eight hundred thirty-two thousand, four hundred seventy-nine".