2145906444 has 36 divisors (see below), whose sum is σ = 5503692152. Its totient is φ = 650274240.

The previous prime is 2145906437. The next prime is 2145906461. The reversal of 2145906444 is 4446095412.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 737497 + ... + 740400.

Almost surely, 2^2145906444 is an apocalyptic number.

It is an amenable number.

2145906444 is an abundant number, since it is smaller than the sum of its proper divisors (3357785708).

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

2145906444 is a wasteful number, since it uses less digits than its factorization.

2145906444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477926 (or 1477913 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 2145906444 is about 46323.9294965356. The cubic root of 2145906444 is about 1289.8432283496.

The spelling of 2145906444 in words is "two billion, one hundred forty-five million, nine hundred six thousand, four hundred forty-four".