2115765 has 12 divisors (see below), whose sum is σ = 3667404. Its totient is φ = 1128384.

The previous prime is 2115761. The next prime is 2115767. The reversal of 2115765 is 5675112.

It can be written as a sum of positive squares in 2 ways, for example, as 1535121 + 580644 = 1239^2 + 762^2 .

It is not a de Polignac number, because 2115765 - 2² = 2115761 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23464 + ... + 23553.

It is an arithmetic number, because the mean of its divisors is an integer number (305617).

2^2115765 is an apocalyptic number.

It is an amenable number.

2115765 is a deficient number, since it is larger than the sum of its proper divisors (1551639).

2115765 is a wasteful number, since it uses less digits than its factorization.

2115765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47028 (or 47025 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 2115765 is about 1454.5669458640. The cubic root of 2115765 is about 128.3775676303.

The spelling of 2115765 in words is "two million, one hundred fifteen thousand, seven hundred sixty-five".