1388399 has 4 divisors (see below), whose sum is σ = 1391136. Its totient is φ = 1385664.

The previous prime is 1388393. The next prime is 1388411. The reversal of 1388399 is 9938831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9938831 = 7 ⋅1419833.

It is a cyclic number.

It is not a de Polignac number, because 1388399 - 2¹² = 1384303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388393) 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, 359 + ... + 1704.

It is an arithmetic number, because the mean of its divisors is an integer number (347784).

2^1388399 is an apocalyptic number.

1388399 is a deficient number, since it is larger than the sum of its proper divisors (2737).

1388399 is an equidigital number, since it uses as much as digits as its factorization.

1388399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2736.

The product of its digits is 46656, while the sum is 41.

The square root of 1388399 is about 1178.3034413936. The cubic root of 1388399 is about 111.5590388938.

The spelling of 1388399 in words is "one million, three hundred eighty-eight thousand, three hundred ninety-nine".