1388623 has 2 divisors, whose sum is σ = 1388624. Its totient is φ = 1388622.

The previous prime is 1388603. The next prime is 1388627. The reversal of 1388623 is 3268831.

It is a strong prime.

It is an emirp because it is prime and its reverse (3268831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388623 is a prime.

It is a super-2 number, since 2×1388623² = 3856547672258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1388627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694311 + 694312.

It is an arithmetic number, because the mean of its divisors is an integer number (694312).

2^1388623 is an apocalyptic number.

1388623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388623 is an equidigital number, since it uses as much as digits as its factorization.

1388623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 31.

The square root of 1388623 is about 1178.3984894763. The cubic root of 1388623 is about 111.5650381013.

The spelling of 1388623 in words is "one million, three hundred eighty-eight thousand, six hundred twenty-three".