2145804844 has 12 divisors (see below), whose sum is σ = 3765228544. Its totient is φ = 1070025264.

The previous prime is 2145804839. The next prime is 2145804887. The reversal of 2145804844 is 4484085412.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2145804797 and 2145804806.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 717612 + ... + 720595.

Almost surely, 2^2145804844 is an apocalyptic number.

It is an amenable number.

2145804844 is a deficient number, since it is larger than the sum of its proper divisors (1619423700).

2145804844 is a wasteful number, since it uses less digits than its factorization.

2145804844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1438584 (or 1438582 counting only the distinct ones).

The product of its (nonzero) digits is 163840, while the sum is 40.

The square root of 2145804844 is about 46322.8328581057. The cubic root of 2145804844 is about 1289.8228717398.

The spelling of 2145804844 in words is "two billion, one hundred forty-five million, eight hundred four thousand, eight hundred forty-four".