309799449 has 12 divisors (see below), whose sum is σ = 473811156. Its totient is φ = 194383872.

The previous prime is 309799423. The next prime is 309799453. The reversal of 309799449 is 944997903.

It can be written as a sum of positive squares in 2 ways, for example, as 135559449 + 174240000 = 11643^2 + 13200^2 .

It is not a de Polignac number, because 309799449 - 2¹⁷ = 309668377 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 309799395 and 309799404.

It is not an unprimeable number, because it can be changed into a prime (309799849) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1012264 + ... + 1012569.

It is an arithmetic number, because the mean of its divisors is an integer number (39484263).

Almost surely, 2^309799449 is an apocalyptic number.

It is an amenable number.

309799449 is a deficient number, since it is larger than the sum of its proper divisors (164011707).

309799449 is a wasteful number, since it uses less digits than its factorization.

309799449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024856 (or 2024853 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 54.

The square root of 309799449 is about 17601.1206745480. The cubic root of 309799449 is about 676.6439665218.

The spelling of 309799449 in words is "three hundred nine million, seven hundred ninety-nine thousand, four hundred forty-nine".