1388166 has 36 divisors (see below), whose sum is σ = 3089772. Its totient is φ = 415584.

The previous prime is 1388161. The next prime is 1388171. The reversal of 1388166 is 6618831.

It is an interprime number because it is at equal distance from previous prime (1388161) and next prime (1388171).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388161) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 37500 + ... + 37536.

It is an arithmetic number, because the mean of its divisors is an integer number (85827).

2^1388166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1544886).

1388166 is an abundant number, since it is smaller than the sum of its proper divisors (1701606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1388166 is a wasteful number, since it uses less digits than its factorization.

1388166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 55 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 1388166 is about 1178.2045662787. The cubic root of 1388166 is about 111.5527979621.

The spelling of 1388166 in words is "one million, three hundred eighty-eight thousand, one hundred sixty-six".