1388066 has 4 divisors (see below), whose sum is σ = 2082102. Its totient is φ = 694032.

The previous prime is 1388063. The next prime is 1388069. The reversal of 1388066 is 6608831.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1388063) and next prime (1388069).

It can be written as a sum of positive squares in only one way, i.e., 714025 + 674041 = 845^2 + 821^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1388063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347015 + ... + 347018.

2^1388066 is an apocalyptic number.

1388066 is a deficient number, since it is larger than the sum of its proper divisors (694036).

1388066 is an equidigital number, since it uses as much as digits as its factorization.

1388066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694035.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1388066 is about 1178.1621280622. The cubic root of 1388066 is about 111.5501192364.

The spelling of 1388066 in words is "one million, three hundred eighty-eight thousand, sixty-six".