2145663 has 16 divisors (see below), whose sum is σ = 3423840. Its totient is φ = 1320192.

The previous prime is 2145643. The next prime is 2145677. The reversal of 2145663 is 3665412.

It is not a de Polignac number, because 2145663 - 2⁵ = 2145631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145643) 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, 2706 + ... + 3407.

It is an arithmetic number, because the mean of its divisors is an integer number (213990).

2^2145663 is an apocalyptic number.

2145663 is a deficient number, since it is larger than the sum of its proper divisors (1278177).

2145663 is a wasteful number, since it uses less digits than its factorization.

2145663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6135 (or 6129 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 2145663 is about 1464.8081785681. The cubic root of 2145663 is about 128.9794450754.

The spelling of 2145663 in words is "two million, one hundred forty-five thousand, six hundred sixty-three".