1161765 has 24 divisors (see below), whose sum is σ = 2197728. Its totient is φ = 563040.

The previous prime is 1161761. The next prime is 1161767. The reversal of 1161765 is 5671611.

It is not a de Polignac number, because 1161765 - 2² = 1161761 is a prime.

1161765 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161761) 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, 679 + ... + 1668.

It is an arithmetic number, because the mean of its divisors is an integer number (91572).

2^1161765 is an apocalyptic number.

1161765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1161765 is a deficient number, since it is larger than the sum of its proper divisors (1035963).

1161765 is a wasteful number, since it uses less digits than its factorization.

1161765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2369 (or 2366 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 1161765 is about 1077.8520306610. The cubic root of 1161765 is about 105.1250211491.

It can be divided in two parts, 116 and 1765, that added together give a palindrome (1881).

The spelling of 1161765 in words is "one million, one hundred sixty-one thousand, seven hundred sixty-five".