2157765 has 16 divisors (see below), whose sum is σ = 3490368. Its totient is φ = 1138176.

The previous prime is 2157763. The next prime is 2157767. The reversal of 2157765 is 5677512.

It is an interprime number because it is at equal distance from previous prime (2157763) and next prime (2157767).

It is not a de Polignac number, because 2157765 - 2¹ = 2157763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157763) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 714 + ... + 2196.

It is an arithmetic number, because the mean of its divisors is an integer number (218148).

2^2157765 is an apocalyptic number.

It is an amenable number.

2157765 is a deficient number, since it is larger than the sum of its proper divisors (1332603).

2157765 is a wasteful number, since it uses less digits than its factorization.

2157765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588.

The product of its digits is 14700, while the sum is 33.

The square root of 2157765 is about 1468.9332864361. The cubic root of 2157765 is about 129.2214811864.

The spelling of 2157765 in words is "two million, one hundred fifty-seven thousand, seven hundred sixty-five".