1097865 has 24 divisors (see below), whose sum is σ = 1966848. Its totient is φ = 565920.

The previous prime is 1097861. The next prime is 1097869. The reversal of 1097865 is 5687901.

It is an interprime number because it is at equal distance from previous prime (1097861) and next prime (1097869).

It is not a de Polignac number, because 1097865 - 2² = 1097861 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1097861) 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, 1002 + ... + 1788.

It is an arithmetic number, because the mean of its divisors is an integer number (81952).

2^1097865 is an apocalyptic number.

1097865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1097865 is a deficient number, since it is larger than the sum of its proper divisors (868983).

1097865 is a wasteful number, since it uses less digits than its factorization.

1097865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829 (or 826 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 1097865 is about 1047.7905325016. The cubic root of 1097865 is about 103.1611828955.

Adding to 1097865 its sum of digits (36), we get a palindrome (1097901).

The spelling of 1097865 in words is "one million, ninety-seven thousand, eight hundred sixty-five".