2163765 has 16 divisors (see below), whose sum is σ = 3515328. Its totient is φ = 1136256.

The previous prime is 2163761. The next prime is 2163767. The reversal of 2163765 is 5673612.

It is not a de Polignac number, because 2163765 - 2² = 2163761 is a prime.

It is an Ulam number.

2163765 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2163761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72 + ... + 2081.

It is an arithmetic number, because the mean of its divisors is an integer number (219708).

2^2163765 is an apocalyptic number.

It is an amenable number.

2163765 is a deficient number, since it is larger than the sum of its proper divisors (1351563).

2163765 is a wasteful number, since it uses less digits than its factorization.

2163765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228.

The product of its digits is 7560, while the sum is 30.

The square root of 2163765 is about 1470.9741670063. The cubic root of 2163765 is about 129.3411437933.

The spelling of 2163765 in words is "two million, one hundred sixty-three thousand, seven hundred sixty-five".