2009778489 has 6 divisors (see below), whose sum is σ = 2903013386. Its totient is φ = 1339852320.

The previous prime is 2009778487. The next prime is 2009778493. The reversal of 2009778489 is 9848779002.

2009778489 is a `hidden beast` number, since 2 + 0 + 0 + 97 + 78 + 489 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1831155264 + 178623225 = 42792^2 + 13365^2 .

It is not a de Polignac number, because 2009778489 - 2¹ = 2009778487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2009778481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111654352 + ... + 111654369.

Almost surely, 2^2009778489 is an apocalyptic number.

It is an amenable number.

2009778489 is a deficient number, since it is larger than the sum of its proper divisors (893234897).

2009778489 is a wasteful number, since it uses less digits than its factorization.

2009778489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223308727 (or 223308724 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The square root of 2009778489 is about 44830.5530748841. The cubic root of 2009778489 is about 1261.9710665264.

The spelling of 2009778489 in words is "two billion, nine million, seven hundred seventy-eight thousand, four hundred eighty-nine".