2145444 has 24 divisors (see below), whose sum is σ = 5721408. Its totient is φ = 612960.

The previous prime is 2145443. The next prime is 2145469. The reversal of 2145444 is 4445412.

It is a happy number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2145443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12687 + ... + 12854.

It is an arithmetic number, because the mean of its divisors is an integer number (238392).

2^2145444 is an apocalyptic number.

It is an amenable number.

2145444 is an abundant number, since it is smaller than the sum of its proper divisors (3575964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2145444 is a wasteful number, since it uses less digits than its factorization.

2145444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25555 (or 25553 counting only the distinct ones).

The product of its digits is 2560, while the sum is 24.

The square root of 2145444 is about 1464.7334228453. The cubic root of 2145444 is about 128.9750567722.

Subtracting 2145444 from its reverse (4445412), we obtain a cube (2299968 = 132³).

The spelling of 2145444 in words is "two million, one hundred forty-five thousand, four hundred forty-four".