1388243 has 2 divisors, whose sum is σ = 1388244. Its totient is φ = 1388242.

The previous prime is 1388227. The next prime is 1388269. The reversal of 1388243 is 3428831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1388243 - 2⁴ = 1388227 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1388293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694121 + 694122.

It is an arithmetic number, because the mean of its divisors is an integer number (694122).

2^1388243 is an apocalyptic number.

1388243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388243 is an equidigital number, since it uses as much as digits as its factorization.

1388243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 29.

The square root of 1388243 is about 1178.2372426638. The cubic root of 1388243 is about 111.5548604932.

The spelling of 1388243 in words is "one million, three hundred eighty-eight thousand, two hundred forty-three".