309789049 has 16 divisors (see below), whose sum is σ = 334599120. Its totient is φ = 286191360.

The previous prime is 309789019. The next prime is 309789121. The reversal of 309789049 is 940987903.

It can be written as a sum of positive squares in 8 ways, for example, as 17139600 + 292649449 = 4140^2 + 17107^2 .

It is a cyclic number.

It is not a de Polignac number, because 309789049 - 2⁵ = 309789017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 309788993 and 309789011.

It is not an unprimeable number, because it can be changed into a prime (309789019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63087 + ... + 67819.

It is an arithmetic number, because the mean of its divisors is an integer number (20912445).

Almost surely, 2^309789049 is an apocalyptic number.

It is an amenable number.

309789049 is a deficient number, since it is larger than the sum of its proper divisors (24810071).

309789049 is a wasteful number, since it uses less digits than its factorization.

309789049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4860.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 309789049 is about 17600.8252363348. The cubic root of 309789049 is about 676.6363947674.

The spelling of 309789049 in words is "three hundred nine million, seven hundred eighty-nine thousand, forty-nine".