2163945 has 32 divisors (see below), whose sum is σ = 4071168. Its totient is φ = 960768.

The previous prime is 2163923. The next prime is 2163949. The reversal of 2163945 is 5493612.

2163945 = T₃₃₄ + T₃₃₅ + ... + T₃₆₈.

It is not a de Polignac number, because 2163945 - 2⁶ = 2163881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2163949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3607 + ... + 4163.

It is an arithmetic number, because the mean of its divisors is an integer number (127224).

2^2163945 is an apocalyptic number.

It is an amenable number.

2163945 is a deficient number, since it is larger than the sum of its proper divisors (1907223).

2163945 is a wasteful number, since it uses less digits than its factorization.

2163945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609.

The product of its digits is 6480, while the sum is 30.

The square root of 2163945 is about 1471.0353496772. The cubic root of 2163945 is about 129.3447302518.

The spelling of 2163945 in words is "two million, one hundred sixty-three thousand, nine hundred forty-five".