1388866 has 8 divisors (see below), whose sum is σ = 2205900. Its totient is φ = 653568.

The previous prime is 1388837. The next prime is 1388873. The reversal of 1388866 is 6688831.

It can be written as a sum of positive squares in 2 ways, for example, as 1311025 + 77841 = 1145^2 + 279^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20391 + ... + 20458.

2^1388866 is an apocalyptic number.

1388866 is a deficient number, since it is larger than the sum of its proper divisors (817034).

1388866 is a wasteful number, since it uses less digits than its factorization.

1388866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40868.

The product of its digits is 55296, while the sum is 40.

The square root of 1388866 is about 1178.5015910044. The cubic root of 1388866 is about 111.5715454406.

The spelling of 1388866 in words is "one million, three hundred eighty-eight thousand, eight hundred sixty-six".