1161780 has 72 divisors (see below), whose sum is σ = 3507168. Its totient is φ = 287232.

The previous prime is 1161767. The next prime is 1161781. The reversal of 1161780 is 871611.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1161780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17307 + ... + 17373.

2^1161780 is an apocalyptic number.

1161780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1161780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1753584).

1161780 is an abundant number, since it is smaller than the sum of its proper divisors (2345388).

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

1161780 is a wasteful number, since it uses less digits than its factorization.

1161780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 24.

The square root of 1161780 is about 1077.8589889220. The cubic root of 1161780 is about 105.1254735838.

The spelling of 1161780 in words is "one million, one hundred sixty-one thousand, seven hundred eighty".