1391166 has 48 divisors (see below), whose sum is σ = 3520608. Its totient is φ = 388800.

The previous prime is 1391129. The next prime is 1391183. The reversal of 1391166 is 6611931.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7596 + ... + 7776.

It is an arithmetic number, because the mean of its divisors is an integer number (73346).

2^1391166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1760304).

1391166 is an abundant number, since it is smaller than the sum of its proper divisors (2129442).

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

1391166 is a wasteful number, since it uses less digits than its factorization.

1391166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 254 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 1391166 is about 1179.4770027432. The cubic root of 1391166 is about 111.6330999825.

The spelling of 1391166 in words is "one million, three hundred ninety-one thousand, one hundred sixty-six".