2145644 has 24 divisors (see below), whose sum is σ = 3907008. Its totient is φ = 1030400.

The previous prime is 2145643. The next prime is 2145677. The reversal of 2145644 is 4465412.

2145644 = T₄₇ + T₄₈ + ... + T₂₃₄.

2145644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (2145641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18932 + ... + 19044.

It is an arithmetic number, because the mean of its divisors is an integer number (162792).

2^2145644 is an apocalyptic number.

It is an amenable number.

2145644 is a deficient number, since it is larger than the sum of its proper divisors (1761364).

2145644 is a wasteful number, since it uses less digits than its factorization.

2145644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 263 counting only the distinct ones).

The product of its digits is 3840, while the sum is 26.

The square root of 2145644 is about 1464.8016930629. The cubic root of 2145644 is about 128.9790643669.

The spelling of 2145644 in words is "two million, one hundred forty-five thousand, six hundred forty-four".