1388455 has 4 divisors (see below), whose sum is σ = 1666152. Its totient is φ = 1110760.

The previous prime is 1388449. The next prime is 1388461. The reversal of 1388455 is 5548831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5548831 = 29 ⋅191339.

It is an interprime number because it is at equal distance from previous prime (1388449) and next prime (1388461).

It is not a de Polignac number, because 1388455 - 2⁷ = 1388327 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 1388455.

It is a congruent number.

It is an unprimeable number.

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, 138841 + ... + 138850.

It is an arithmetic number, because the mean of its divisors is an integer number (416538).

2^1388455 is an apocalyptic number.

1388455 is a deficient number, since it is larger than the sum of its proper divisors (277697).

1388455 is an equidigital number, since it uses as much as digits as its factorization.

1388455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277696.

The product of its digits is 19200, while the sum is 34.

The square root of 1388455 is about 1178.3272041330. The cubic root of 1388455 is about 111.5605387562.

The spelling of 1388455 in words is "one million, three hundred eighty-eight thousand, four hundred fifty-five".