1153866 has 32 divisors (see below), whose sum is σ = 2677248. Its totient is φ = 324720.

The previous prime is 1153853. The next prime is 1153871. The reversal of 1153866 is 6683511.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3321 + ... + 3651.

It is an arithmetic number, because the mean of its divisors is an integer number (83664).

2^1153866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1153866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1338624).

1153866 is an abundant number, since it is smaller than the sum of its proper divisors (1523382).

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

1153866 is a wasteful number, since it uses less digits than its factorization.

1153866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426.

The product of its digits is 4320, while the sum is 30.

The square root of 1153866 is about 1074.1815489013. The cubic root of 1153866 is about 104.8862259696.

The spelling of 1153866 in words is "one million, one hundred fifty-three thousand, eight hundred sixty-six".